The Tool Desk
Outbyte PC Repair FREERepair Windows errors before they cause bigger problemsFix Now →Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →“The program can’t start because api-ms-win-mm-time-l1-1-0.dll is missing from your computer.” The api-ms-win-mm-time-l1-1-0.dll message usually points to an unsupported application build, damaged Windows components, or an incomplete installation, not a DLL that you should download manually.
Which fix applies to you
Start with the situation that matches your error:
- One game or program fails, especially after installation: repair or verify that application first.
- Several programs report different
api-ms-win-*files: check Windows compatibility before downloading anything. The application may require a newer Windows API. - The error began after an update, crash, disk problem, or security event: repair Windows with DISM and SFC, then check antivirus history.
- The affected program is an older game on Windows 7 or early Windows 8: treat this as a compatibility problem. An older operating system may not provide the API contracts used by the game.
- The message says an entry point could not be found: the wrong API surface or an incompatible binary may be loading. Copying another DLL will not reliably solve it.
- Only a 32-bit or 64-bit version fails: check the application architecture and repair it with the matching build.
On Windows 10 and Windows 11, follow the repairs below in order.
What api-ms-win-mm-time-l1-1-0.dll actually is
This is a genuine Microsoft Windows API-set contract associated with multimedia timing functions such as timeBeginPeriod, timeGetTime, and timeGetSystemTime. The mm-time name refers to multimedia timing functionality, historically hosted through Windows multimedia components.
It is not a normal third-party application library, Visual C++ runtime file, DirectX package, or .NET file. Microsoft explains that API-set names are virtual aliases resolved by the Windows loader through the API-set schema. Read Microsoft’s Windows API sets documentation and its explanation of API-set loader operation.
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That means every Windows installation does not necessarily contain a conventional file named exactly api-ms-win-mm-time-l1-1-0.dll. The loader may resolve the contract to an appropriate Windows host without a same-named file being visible on disk. Public Windows file inventories have described it as an “ApiSet Stub DLL” related to winmm.dll, but its physical location and representation vary by Windows version and architecture.
The error still matters. It means the program asked Windows for an API contract that could not be resolved in the current environment.
1. Identify the failing program and Windows build
Before changing files, record what is actually failing.
- Press Windows key + R.
- Type
winver, then press Enter. - Note the Windows edition and version shown.
- Open Settings → System → About.
- Record System type, such as 64-bit operating system or 32-bit operating system.
- Write down the complete error message and the name of the game or program.
- Note whether the error began after an update, reinstall, antivirus alert, or hardware change.
Also check whether other programs start normally. If only one application fails, repair that application before modifying Windows. If several programs report several api-ms-win-* contracts, compatibility is more likely than a collection of independently missing files.
A 32-bit program needs 32-bit dependencies, while a 64-bit program needs 64-bit dependencies. On 64-bit Windows, do not try to solve this by manually placing files in System32 or SysWOW64; API-set resolution does not work like ordinary application DLL copying.
2. Check Windows compatibility first
If the error appears in an older game or program, open the publisher’s current system requirements and compare them with your Windows version. This is especially important for older Windows 7 or early Windows 8 installations and games such as Just Cause 4. A game may be listed with an older minimum requirement while a particular build still expects API contracts that are not available on that installation.
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The definitive solutions are to:
- Upgrade to a Windows version supported by the application.
- Install a game or application build that officially supports your operating system.
- Contact the publisher if the current build and published requirements do not agree.
Do not rename winmm.dll, kernel32.dll, or another Windows binary to api-ms-win-mm-time-l1-1-0.dll. That is not a compatibility layer and can cause crashes, loader hijacking, or additional missing-entry-point errors.
3. Install Windows updates and restart
A current Windows installation may repair missing or damaged operating-system components through servicing.
- Open Settings.
- Select Windows Update.
- Choose Check for updates.
- Install all available updates.
- Restart the computer, even if Windows does not immediately require it.
- Start the affected program again.
Do not assume that installing a newer Visual C++ package can add a Windows API contract to an unsupported operating system. Update Windows first, then test the application.
4. Repair Windows with DISM and SFC
Use these commands when the error began after corruption, a failed update, a disk problem, or suspected malware removal.
- Open Start.
- Type Command Prompt.
- Right-click Command Prompt and select Run as administrator.
- Enter this command and press Enter:
DISM.exe /Online /Cleanup-Image /RestoreHealth
- Wait for DISM to finish. It can take time and may appear paused.
- Then run:
sfc /scannow
- Wait until verification reaches 100 percent.
- Restart Windows and test the affected program.
Microsoft recommends running DISM before SFC when repairing missing or corrupted protected Windows files. See Microsoft’s System File Checker repair procedure.
If SFC reports that it repaired files, restart and test again. If it reports no integrity violations but the program still fails, the application may require APIs unavailable on your Windows version. If DISM or SFC cannot complete, repeat after Windows Update, then consider System Restore, an in-place repair, or Windows recovery options.
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5. Verify or reinstall the affected application
A failed update, incomplete download, bad disk, or interrupted installation can leave an executable that cannot resolve its dependencies.
Epic Games Launcher
- Open Epic Games Launcher.
- Select Library.
- Find the affected game.
- Click the three dots beside it.
- Select Manage.
- Click Verify.
- Wait for the check and replacement of damaged files.
- Start the game again.
Steam
- Open Steam.
- Select Library.
- Right-click the affected game.
- Choose Properties.
- Select Installed Files.
- Click Verify integrity of game files.
- Wait for the process to finish, then retry the game.
If verification does not help, uninstall the application, restart Windows, and install it again from its official launcher or publisher source. Do not preserve a suspicious replacement DLL in the old installation folder.
6. Check antivirus quarantine
Security software may quarantine an application file after an update or false detection.
Do these 3 things before closing this tab:
1Repair Windows errors before they cause bigger problems2Scan for outdated or missing drivers - takes under a minute3Clear out junk files and repair common Windows errors- Open Windows Security.
- Select Virus & threat protection.
- Choose Protection history.
- Review entries from the time the error began.
- Select an item only if you can identify the affected publisher and installation.
- Verify the publisher and digital signature before restoring anything.
If the file’s origin is unclear, do not restore it. Remove the application and reinstall it from the official source instead. Microsoft documents this workflow in its guide to Protection History.
7. Update drivers only when evidence points to them
A driver is not the normal source of this API-set contract, so do not begin by replacing random audio, graphics, or chipset files. Consider drivers only if the error began immediately after a hardware or driver update, Device Manager shows a warning, or the program has related graphics or audio failures.
- Right-click Start.
- Select Device Manager.
- Expand the relevant category, such as Display adapters, Sound, video and game controllers, or System devices.
- Right-click the affected device.
- Select Update driver.
- Choose Search automatically for drivers.
- Restart Windows after installation.
For a recent driver problem, open the device’s Properties → Driver tab and use Roll Back Driver if the button is available. Otherwise download the driver only from the computer or hardware manufacturer’s official support page.
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8. Do not install the wrong runtime
api-ms-win-mm-time-l1-1-0.dll is not the same as api-ms-win-crt-time-l1-1-0.dll.
The api-ms-win-crt-time contract belongs to the Universal C Runtime. A Microsoft Visual C++ Redistributable package may be relevant when an error specifically names a missing api-ms-win-crt-* file or another Visual C++ runtime component. It is not a general repair for the mm-time API-set error.
If the error names a Visual C++ runtime, use Microsoft’s latest supported Visual C++ Redistributable downloads. Install x86 for a 32-bit application and x64 for a 64-bit application on 64-bit Windows.
Do not randomly install DirectX, .NET, or Visual C++ packages hoping they will create this API-set contract.
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Do not download this file from random DLL websites. An unsigned download may contain malware, have the wrong architecture, belong to a different Windows build, or fail because the real problem is operating-system compatibility. Copying it into System32, SysWOW64, or the game directory can also create loader and version conflicts.
Do not run:
regsvr32 api-ms-win-mm-time-l1-1-0.dll
regsvr32 is for registering DLLs that provide registration entry points such as DllRegisterServer; it is not a missing-runtime repair command. Microsoft documents its purpose in the regsvr32 command reference.
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Manual copying is appropriate only for controlled developer or forensic work using a verified, same-build Windows image. It is not a safe consumer fix.
FAQ
Is api-ms-win-mm-time-l1-1-0.dll a real Microsoft file?
Yes. It is a genuine Windows API-set contract associated with multimedia timing APIs. It may not appear as a conventional, separately stored DLL with that exact name.
Does every Windows installation contain it?
No. The Windows loader can resolve API-set contracts through the API-set schema, so the same-named file may not be visible on every version or architecture.
Should I download it?
No. Repair Windows, verify the affected application, or upgrade to a supported operating system instead.
Will Visual C++ fix it?
Usually not. Visual C++ relates to different runtime contracts, including api-ms-win-crt-time-l1-1-0.dll. Install it only when the error specifically identifies a Visual C++ runtime problem.
Why do several missing API-set files appear together?
That pattern often indicates that the application was built for a newer or different Windows environment. It is more likely an OS/application compatibility mismatch than many unrelated missing files.
What’s actually slowing this PC down?
Pick the symptom - the matching free tool is one click away.
What should I give technical support?
Provide your Windows edition and build, 32-bit or 64-bit status, exact full error text, affected program, installation source, recent update or antivirus history, and whether other api-ms-win-* files are also reported.
Prevent the error from returning
Keep Windows and the application updated through their official update channels. Verify game files after interrupted updates, maintain free disk space, and review antivirus quarantine before restoring application files. Keep the application’s supported Windows requirements available when installing older games.
If the problem remains after Windows repair and application reinstallation, the strongest remaining explanation is an unsupported application build or operating system. At that point, use a supported Windows version or an officially compatible release rather than replacing Windows DLLs manually.
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