“The program can’t start because wxmsw28u_richtext_vc_custom.dll is missing from your computer.” If wxmsw28u_richtext_vc_custom.dll was not found, could not be loaded, or is reported as invalid, repair the application that originally installed it rather than copying a random DLL into Windows.
Which fix applies to you
Choose the closest situation:
- The error appeared after an update, failed install, or uninstall: repair or reinstall the affected application.
- A launcher or game displays the error: use its Verify, Repair, or Scan files option.
- Windows Security recently quarantined a file: inspect Protection history, then repair the application from its official installer.
- The error says “specified module could not be found”: the named DLL or one of its dependencies may be missing.
- The message says the file is not designed to run on Windows: suspect corruption, the wrong architecture, or an incompatible build.
- A second copy of the same program also exists: repair the copy whose executable is actually failing.
- The application also names an MSVC runtime: install the correct Microsoft Visual C++ Redistributable, but do not expect it to recreate this wxWidgets file.
What wxmsw28u_richtext_vc_custom.dll is
This is a Windows library from wxWidgets, an application framework used by third-party Windows programs. It is not a Windows system component, and there is no evidence that Windows normally installs it.
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The name describes the build:
wxmswmeans wxWidgets for Microsoft Windows.28refers to the wxWidgets 2.8 branch.uindicates a Unicode build.richtextidentifies the wxRichText component.vcindicates a Microsoft Visual C++ build.customis a vendor/build suffix used by wxWidgets naming conventions.
The filename identifies the framework library, not the application vendor. You cannot determine the exact program from this DLL name alone.
The unsuffixed filename is associated with the 32-bit build. wxWidgets also uses a separate name ending in _64.dll for a 64-bit build. A commonly indexed record lists version 2.8.9.0, 32-bit, and approximately 0.76 MB, but third-party catalog details do not verify the provenance or compatibility of a particular copy.
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Fix 1: Repair or reinstall the application
This is the most reliable fix because the correct DLL must match the application’s wxWidgets version, compiler build, architecture, and other files.
Identify the failing program
- Read the title bar and the complete error message.
- Note whether it appears when starting a desktop shortcut, launcher, game, or utility.
- Right-click the shortcut and select Properties.
- Check the Target field. The executable path usually reveals the application folder.
- Open Task Manager with
Ctrl+Shift+Escif the program briefly appears before failing. - Check Settings > Apps > Installed apps for the matching application.
- If several copies exist, note which shortcut or executable produced the error.
Do not delete the DLL manually. Removing more files can make the later repair less reliable.
Repair from Windows Settings
- Open Settings.
- Select Apps > Installed apps.
- Find the affected application.
- Select the three-dot menu beside it.
- Choose Advanced options, if available.
- Select Repair and wait for it to finish.
- Start the application again.
If Repair is unavailable, uninstall the application, restart Windows, and reinstall it using the developer’s official installer or launcher. If the program stores important documents or profiles, back them up before uninstalling.
Repair from the application’s launcher
Launchers commonly provide their own file check:
- Open the official launcher.
- Select the affected application.
- Open its settings or three-dot menu.
- Choose Verify files, Repair, Scan and repair, or similar.
- Allow the launcher to replace incomplete files.
- Restart Windows if the launcher requests it.
- Start the application from the launcher again.
A successful repair normally removes the DLL error and allows the program to reach its normal login window or main screen. If the same message returns immediately, the installer may be restoring the wrong architecture or another dependency is missing.
Fix 2: Check antivirus quarantine
Security software can quarantine a DLL after an update or during a damaged installation. Do not disable antivirus protection just to force the program to start.
In Windows Security:
- Open Start and search for Windows Security.
- Select Virus & threat protection.
- Choose Protection history.
- Look for an event involving the affected application or its installation folder.
- Expand the event and review the file path and detection details.
- Restore the file only if the application came from a trusted official source and you are confident the detection is incorrect.
- Repair or reinstall the application afterward so its complete, matching files are restored.
If you do not recognize the application, do not restore the quarantined file. Keep it isolated, run a full scan, and obtain a clean installer from the application developer.
Fix 3: Check for a dependency failure
“Specified module could not be found” does not always mean the named DLL itself is absent. Windows may be unable to load one of the DLL’s required dependencies.
First, inspect the application’s installation log or launcher log. A trusted dependency-analysis tool can also show which imported module is missing. Avoid replacing every DLL named by an internet search result.
If the error names a Microsoft runtime such as MSVCR90.dll, MSVCP90.dll, or VCRUNTIME140.dll, use the Microsoft Visual C++ Redistributable specified by the application vendor. Microsoft provides separate packages including:
vc_redist.x86.exevc_redist.x64.exevc_redist.arm64.exe
A 32-bit application on 64-bit Windows generally needs the x86 package. Newer Visual C++ 2015–2022 runtimes are binary-compatible with one another, but older generations such as 2008, 2010, 2012, and 2013 remain separate products.
Installing a Visual C++ Redistributable does not recreate wxmsw28u_richtext_vc_custom.dll. It only addresses a separate Microsoft runtime dependency when one is actually missing.
Fix 4: Correct an x86 or x64 mismatch
Do not rename wxmsw28u_richtext_vc_custom_64.dll to remove _64, and do not replace the unsuffixed file with a random 64-bit copy.
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To check the application architecture:
- Start the application, if possible.
- Open Task Manager.
- Select Details.
- Right-click a column heading and choose Select columns.
- Enable Platform, if that column is available.
- Compare the application’s architecture with the DLL and runtime package being installed.
The exact DLL must come from the application’s own installer or an official installation archive. A 64-bit version of Windows can run 32-bit applications; it does not convert those applications into 64-bit programs.
Fix 5: Check Windows Features only when the installer requires it
wxWidgets is not repaired by randomly enabling Windows components. Use Windows Features only if the application’s documentation or installer specifically requests a legacy Windows feature.
- Press
Win+R. - Type
optionalfeatures. - Press Enter.
- Review the feature named by the application’s instructions.
- Select it, choose OK, and restart if prompted.
Do not enable unrelated features as a substitute for reinstalling the application. If the program still reports the same DLL after the requested feature is enabled, return to the application repair path.
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Fix 6: Run DISM and System File Checker for Windows corruption
SFC and DISM repair protected Windows components. They do not normally restore a third-party wxWidgets DLL, so use them when Windows itself is also showing corruption, update failures, or system-file errors.
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- Search for Command Prompt.
- Right-click it and choose Run as administrator.
- Run:
DISM.exe /Online /Cleanup-Image /RestoreHealth
- Wait for DISM to complete.
- Then run:
sfc /scannow
- Restart Windows.
- Try the affected application again.
If SFC reports repaired files but the application still shows the same message, reinstall or repair the application. The result does not prove that the wxWidgets DLL was repaired.
When repeatedly hunting corrupted components and comparing repair results becomes impractical, Outbyte PC Repair can scan for problems and show what needs attention; its free scan identifies issues, while repair is handled by the full version. Reinstalling the application remains the definitive fix when this specific wxWidgets file belongs to that program.
Fix 7: Update drivers only for broader system symptoms
A graphics or chipset driver is not a substitute for wxmsw28u_richtext_vc_custom.dll. Consider driver work only if the application also crashes with display errors, hardware warnings, or device failures.
- Right-click Start.
- Select Device Manager.
- Expand the relevant category, such as Display adapters.
- Right-click the device.
- Choose Update driver.
- Select Search automatically for drivers.
- Restart Windows if a driver is installed.
For a clean replacement, download the driver from the computer or hardware manufacturer’s official support page. Outbyte Driver Updater can scan for outdated drivers and identify what needs updating; its free scan shows the findings, while installation is handled by the full version. Driver replacement is secondary here, and the application’s own installer remains the correct source for this DLL.
Do not use System32, SysWOW64, or regsvr32
Do not copy this file into C:WindowsSystem32, C:WindowsSysWOW64, or another global Windows directory. Application-local DLL deployment prevents unrelated programs from loading an incompatible copy.
Do not register this file with regsvr32. Ordinary wxWidgets runtime libraries generally do not expose the COM registration entry point required by that utility. regsvr32 is intended for DLLs that provide DllRegisterServer; it does not repair a missing application library.
Downloading the file from a random DLL collection site is also unsafe. The copy may contain malware, target the wrong architecture, use a different compiler build, or fail because another dependency is missing. Use the application developer’s official installer, launcher, repair archive, or support channel instead.
When to check for malware, disk damage, or System Restore
Use a reputable malware scan if the file disappeared unexpectedly, antivirus detected the application directory, or other programs are being altered. Back up important data before investigating suspected disk problems.
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FAQ
Is wxmsw28u_richtext_vc_custom.dll part of Windows?
No evidence indicates that Windows ships this DLL. It normally belongs beside the third-party application that was built with wxWidgets.
Which application installed it?
The filename alone cannot identify the end-user application. Find the executable path from the shortcut, Task Manager, launcher, or installed-app entry.
Is this DLL 32-bit or 64-bit?
The unsuffixed filename is associated with the 32-bit build. A separate wxWidgets filename uses _64.dll for 64-bit builds.
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Will installing Visual C++ Redistributable fix it?
Only if the application also has a missing Microsoft runtime dependency. Visual C++ Redistributable does not recreate this wxWidgets DLL.
Should I copy it into System32?
No. Restore the exact application-local copy through the program’s repair or reinstall process.
Should I run regsvr32?
Normally no. This is a runtime library, not ordinarily a COM component requiring registration.
What information should I provide if reinstalling fails?
Record the exact error text, application and executable name, application version, Windows version, whether antivirus quarantine or an update preceded the failure, and whether the program is 32-bit or 64-bit. This information lets the application vendor identify the correct build and dependency set.
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