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A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11a0001730.dll may appear in messages such as “The program can’t start because a0001730.dll is missing from your computer” or “Error loading a0001730.dll.” It may also be reported as not found, missing or corrupted, or unable to load.
The 60-second answer
a0001730.dll is associated with the legacy Microsoft Internet Information Services helper library. The unusual filename appears to be an archive or index alias for the older IIS file INFOCOMM.DLL, which Microsoft documentation identifies under:
%WINDIR%System32inetsrvinfocomm.dll
That distinction matters. a0001730.dll is not a normal modern Visual C++ runtime, DirectX component, graphics-driver file, or game DLL. There is no verified Microsoft standalone download for a file literally named a0001730.dll.
The safest repair is to identify the executable producing the error, then repair or reinstall the old application or IIS component that needs it. Do not download a random copy into System32, SysWOW64, or the application folder, and do not begin by running regsvr32.
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What a0001730.dll probably is
Public file metadata describes a0001730.dll as a Microsoft Internet Information Services Helper library associated with Microsoft Corporation and IIS. Microsoft’s own legacy IIS file information uses the canonical name infocomm.dll, not a0001730.dll. Microsoft lists the file in the legacy IIS path shown above in its IIS security documentation.
The strongest practical conclusion is that the error refers to an old IIS helper library through a renamed or indexed filename. The exact mechanism that produced the a0001730.dll label is not documented by Microsoft, so treat the alias relationship as an identification clue rather than proof that Microsoft shipped a file with this exact name.
IIS 5.1 was associated with Windows XP Professional, while IIS 6.0 was associated with Windows Server 2003. Microsoft’s IIS SDK documentation describes that legacy product generation. A current Windows 10 or Windows 11 installation should not automatically be assumed to contain this old helper library.
What the error does and does not prove
These messages can be produced by an application, installer, service, or IIS executable:
The program can't start because a0001730.dll is missing from your computer.
This application failed to start because a0001730.dll was not found.
The file a0001730.dll is missing or corrupted.
Error loading a0001730.dll. The specified module could not be found.
Failed to load a0001730.dll.
Cannot find a0001730.dll.
“The specified module could not be found” does not always mean the named DLL itself is absent. Windows may have found the requested DLL but failed to locate one of its dependencies.
The message also does not identify the correct repair by itself. Before changing files, record:
- The complete error text
- The program or installer shown in the title bar
- The executable name, if visible
- The path of the executable
- The Windows edition and version
- Whether IIS is intentionally installed
- Any related Event Viewer entry
- Recent antivirus quarantine activity
- Whether the problem started after an upgrade, application removal, or security update
This prevents a common support mistake: repairing IIS when the actual caller is an obsolete application with a private or incorrect dependency.
Why the error appears
Legacy IIS was removed or damaged
An old Windows installation may have had IIS removed, partially installed, or damaged during maintenance. An application that still expects the IIS helper library can then fail at launch.
An old application still expects IIS
Some legacy installers and line-of-business programs were written for an IIS-era environment. The application may be trying to load INFOCOMM.DLL from an old location even when it is not intended to operate as an IIS server.
If IIS was never required by the application, reinstalling a DLL may only hide a packaging or compatibility defect. Repair the parent application from its original installer instead.
A Windows component is corrupted
Missing or damaged protected Windows files can cause related loading failures. System File Checker can restore protected files, but it cannot recreate an arbitrary application-local DLL or make an incompatible old program work on a new Windows release.
Antivirus quarantined a file
Check whether Windows Security removed a file associated with IIS or the application. Repeated quarantine events should be treated as a security investigation. Do not disable antivirus simply to force an old DLL to load.
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The architecture or Windows vintage is wrong
An old 32-bit IIS component is not interchangeable with a different build, architecture, language, or service-pack level. A mismatched file can cause “not designed to run on Windows,” entry-point errors, crashes, or another missing-dependency message.
The modern system is running obsolete software
On Windows 10 or Windows 11, the most likely issue may be application incompatibility rather than a missing current Windows file. Identify the caller before adding any legacy server components.
Fix 1: Identify the program requesting the file
This is the most important step. The same filename can be requested by different programs, and the correct repair depends on the caller.
Read the error dialog
Look at the title bar and the text immediately around the error. Note whether the dialog names:
inetinfo.exe- An IIS service
- An installer
- A business application
- A game or launcher
- A script host or scheduled task
Open Task Manager with Ctrl+Shift+Esc, select Details, and look for the executable named by the error. Right-click it and choose Open file location.
If the program closes too quickly:
- Press
Windows+R. - Type
eventvwr.msc. - Press Enter.
- Open Windows Logs and select Application.
- Look for an error at the time of the failure.
- Read the Faulting application name, Faulting module name, and event details.
Do not assume that the faulting module is the missing file. The event may identify the executable that initiated the load.
Check the application directory
Right-click the shortcut that produces the error and select Properties. Review the Target field and record the installation directory. Check whether the program has its own inetsrv, System32, or legacy runtime folder.
Do not copy a replacement DLL into that directory yet. First determine whether the program came from an original installer and whether it is supposed to use IIS.
Use Process Monitor if the caller remains unclear
For a persistent but unidentified error, Microsoft Sysinternals Process Monitor can show the process and path involved in a failed file lookup. Filter for:
- Operation is
CreateFile - Path contains
a0001730.dllorinfocomm.dll - Result is
NAME NOT FOUND
The result should reveal which executable requested the file and which directories Windows searched. That is more useful than guessing between System32, SysWOW64, and an application folder.
Fix 2: Repair the application that produced the error
If the error appears when launching a particular program, repair that program before changing Windows components.
Use Windows installed-app repair
On Windows 11:
- Open Settings.
- Select Apps.
- Select Installed apps.
- Find the affected program.
- Select the three-dot menu.
- Choose Advanced options, if available.
- Select Repair.
- Restart the program.
If Repair is not available, select Reset only if you understand that it may remove the application’s settings or local data.
On Windows 10:
- Open Settings.
- Select Apps.
- Select Apps & features.
- Choose the affected application.
- Select Advanced options.
- Choose Repair, if available.
Use the original installer
If Windows does not offer a repair option:
- Close the application.
- Back up its configuration and data.
- Run the original installer as an administrator.
- Choose Repair if offered.
- If repair is unavailable, uninstall the application.
- Restart Windows.
- Install the same supported release from the original vendor or organizational deployment source.
- Test the application before restoring optional plugins or add-ons.
The repair worked if the application starts without the DLL message and its expected function operates normally. If the same error returns, record the executable and path again. The application may be carrying an obsolete dependency that its installer does not correctly provide.
Fix 3: Restore or reinstall the correct IIS component
Use this path only when the calling program genuinely requires IIS or when the error identifies an IIS service.
Check whether IIS is installed on Windows client editions
- Press
Windows+R. - Type
optionalfeatures. - Press Enter.
- Expand Internet Information Services.
- Review the selected components.
- If the application requires a specific IIS feature, enable that feature and select OK.
- Allow Windows to apply the change.
- Restart the computer.
- Test the application or service.
Do not enable every IIS feature simply because one legacy helper is missing. Add only the components required by the application, and confirm that the Windows edition supports them.
Reinstall IIS on supported Windows Server
On a supported Windows Server release, open Server Manager:
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- Select Manage.
- Select Remove Roles and Features if IIS is currently installed and damaged.
- Remove the IIS role only after confirming the server configuration is backed up.
- Restart if requested.
- Open Server Manager again.
- Select Manage and then Add Roles and Features.
- Choose Role-based or feature-based installation.
- Select the server.
- Select Web Server (IIS).
- Add only the required role services.
- Complete the wizard and restart if requested.
PowerShell can install the IIS role on supported Windows Server releases:
Install-WindowsFeature -Name Web-Server -IncludeAllSubFeature -IncludeManagementTools
This command is not a universal repair for Windows XP or Windows Server 2003. Those systems require matching original installation media, service packs, and applicable Microsoft updates. Microsoft’s IIS 6 Resource Kit documents the legacy IIS environment.
The repair worked if the IIS service starts, the required site or application responds, and Event Viewer no longer records the missing helper error. If IIS is installed but the application still asks for a0001730.dll, the application may be requesting the wrong filename or an application-local dependency.
Fix 4: Repair Windows component files with DISM and SFC
Use these commands when Windows files may be damaged, particularly after a failed update, disk problem, or incomplete component change.
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First install pending Windows updates:
- Open Settings.
- Select Windows Update.
- Select Check for updates.
- Install available updates.
- Restart the computer.
- Repeat the check until Windows reports that it is current.
Then open an elevated Command Prompt:
- Open the Start menu.
- Type
Command Prompt. - Right-click Command Prompt.
- Select Run as administrator.
- Approve the User Account Control prompt.
Run DISM first:
DISM.exe /Online /Cleanup-Image /RestoreHealth
Wait for it to complete. Then run System File Checker:
sfc /scannow
Restart Windows after both commands finish and test the failing program.
Possible SFC results include:
- Windows Resource Protection did not find any integrity violations: protected system files appear intact.
- Windows Resource Protection found corrupt files and successfully repaired them: restart and test again.
- Windows Resource Protection found corrupt files but was unable to fix some of them: review the CBS log and continue with application or IIS repair rather than copying a DLL manually.
For additional Microsoft guidance, follow the DISM and System File Checker repair procedure.
SFC and DISM are not substitutes for reinstalling a legacy application. They cannot reliably restore a DLL that belongs only to an old installer or an application’s private directory.
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Repeatedly hunting through Windows folders and rerunning SFC or DISM without knowing what changed can make diagnosis slow. Outbyte PC Repair can scan for issues and show what it identifies; its repair functions require the full version, and reinstalling the affected application remains the definitive fix when that program owns the dependency.
Fix 5: Check Windows Security quarantine
If the file disappeared recently, check Defender history before restoring anything.
- Open Windows Security from the Start menu.
- Select Virus & threat protection.
- Select Protection history.
- Review detections from the time the error began.
- Expand any item associated with IIS or the affected program.
- Confirm the file path and detection details.
- Restore it only if you have verified its origin and the application still requires it.
Microsoft documents this process in its guidance for restoring quarantined files.
If the file is repeatedly quarantined, do not add a broad exclusion or turn off protection. Preserve the detection details, scan the system, and reinstall the parent application or IIS component from trusted installation media.
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1Scan for outdated or missing drivers - takes under a minute2Repair Windows errors before they cause bigger problems3Fix the driver behind crashes, sound loss and screen glitchesFix 6: Check 32-bit and 64-bit compatibility
Windows has separate locations and loading rules for 32-bit and 64-bit programs. A 32-bit program commonly uses C:WindowsSysWOW64, while a 64-bit program commonly uses C:WindowsSystem32. The names are counterintuitive, and manually placing a DLL in both directories is not a valid repair strategy.
There is no verified basis for assuming that a0001730.dll belongs in both locations. The old IIS file was associated with a particular legacy Windows build, and a file from a different architecture or service-pack level may not load.
Check the application architecture:
- Open Task Manager.
- Select Details.
- Right-click the column headings.
- Select Select columns.
- Enable Platform, if available.
- Check whether the process is 32-bit or 64-bit.
You can also right-click the executable, select Properties, and review the Compatibility tab. Compatibility mode may help an old program, but it does not supply missing IIS components and should not be treated as proof that the DLL is compatible.
If the program requires a 32-bit legacy IIS environment, install the matching supported Windows component or run the application in an appropriately maintained older environment. Do not mix a file from another Windows release, language, architecture, or service pack.
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A graphics, chipset, storage, or network driver is not the expected owner of this IIS helper library. Do not install a driver package merely because the error appeared after a reboot.
Investigate drivers only if Event Viewer, Device Manager, or the application vendor identifies a related device or driver:
- Press
Windows+X. - Select Device Manager.
- Expand the relevant device category.
- Right-click the device.
- Select Properties.
- Review the General tab for an error code.
- Open the Driver tab and record the provider, date, and version.
- Use Update Driver or install the correct package from the device or computer manufacturer.
- Restart Windows.
- Test the original application again.
If a driver update caused the issue, use Roll Back Driver when available rather than installing an unrelated DLL.
Finding the right driver manually can mean comparing hardware IDs, package versions, and operating-system support across many devices. Outbyte Driver Updater can scan and identify driver issues; installation through the full version is optional, and it is not a replacement for repairing the IIS or application dependency when the evidence points there.
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Why downloading a0001730.dll is unsafe
Random DLL download pages do not establish that their file came from Microsoft, matches the requested architecture, or belongs to the same Windows build. A file can have the right name and still be altered, incompatible, or missing the dependencies the application actually needs.
Copying it into System32, SysWOW64, or the application directory can also:
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- Hide the original installation problem
- Break another program that loads the same name
- Create a version conflict
- Trigger another antivirus detection
- Leave an unmaintained binary outside normal servicing
- Produce entry-point or “not designed to run” errors
Use original Windows installation media, a matching Microsoft component installation, Windows repair features, or the application’s original installer instead. There is no verified Microsoft standalone download page for a0001730.dll itself.
Why regsvr32 is usually wrong
regsvr32 is not a general-purpose missing-DLL installer. It registers DLLs that provide the appropriate registration entry points, typically for certain COM or ActiveX components.
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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchThe old IIS helper library is not automatically a self-registering COM DLL. Running:
regsvr32 a0001730.dll
does not restore a missing file, repair IIS, or resolve a missing dependency. It may simply report that the entry point is absent.
Use regsvr32 only when the software’s official documentation explicitly requires registration of that exact DLL and provides the correct architecture-specific command. Microsoft explains the command’s intended behavior in its regsvr32 documentation.
If the error remains
Escalate with evidence rather than trying more replacement files. Collect:
- The full error dialog
- The calling executable and complete path
- The requested filename and searched path
- Event Viewer application errors
- Process Monitor results, if captured
- Windows edition and architecture
- IIS role and feature selections
- Antivirus protection history
- DISM and SFC output
- The application’s installer or repair log
If reinstalling IIS did not change the error, the executable may be carrying an obsolete dependency or asking for a renamed private file. If the application is not intended to run IIS, contact its vendor or replace it with a supported release.
If several unrelated files are missing, investigate disk health, System Restore, or an in-place Windows repair. A single a0001730.dll message is not evidence that a graphics driver, Visual C++ package, DirectX installation, or .NET runtime is the cause.
FAQ
Is a0001730.dll a real Microsoft filename?
It is a real filename used in public DLL indexes, but Microsoft’s legacy IIS documentation identifies the relevant component as infocomm.dll. Treat a0001730.dll as an archive or index alias unless the calling application provides stronger evidence.
Is the actual file INFOCOMM.DLL?
INFOCOMM.DLL is the strongest documented identification. Microsoft lists the legacy IIS component as:
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%WINDIR%System32inetsrvinfocomm.dll
The exact reason an index labels it a0001730.dll is not documented.
Should I install IIS on Windows 11 because this error appears?
Not automatically. First identify the executable. The application may be obsolete, incorrectly packaged, or using a private dependency. Install IIS only when the program or service genuinely requires it.
Can I copy the file from another computer?
Do not do this unless the systems, Windows build, architecture, language, service-pack level, and component installation are known to match, and the file is restored through a supported process. A copied DLL may be incompatible or compromised.
Does this require Visual C++ Redistributable or DirectX?
There is no evidence that this IIS helper library is a Visual C++, DirectX, graphics, or game-runtime component. Install those packages only when a separate diagnostic identifies them as missing.
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Will System File Checker fix it?
SFC can repair protected Windows files. It may not restore a legacy IIS file or an application-local dependency. If SFC reports that Windows is healthy, return to the calling application, IIS installation, and compatibility investigation.
Should I register the DLL?
Usually not. regsvr32 does not install missing DLLs and is not a general IIS repair command. Use it only with explicit documentation for that exact component.
What is the safest source for the file?
The safest source is the matching original Windows or IIS installation media, a supported Windows component installation, or the original installer for the application that requested it. Do not use an unverified DLL archive as a substitute.
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