devexpress.bonusskins.v10.1.dll is a DevExpress .NET assembly used by older Windows Forms applications. If Windows reports that devexpress.bonusskins.v10.1.dll is missing, not found, or could not be loaded, repair or reinstall the application that installed it rather than copying a random DLL into a Windows folder.
| Item | Identification |
|---|---|
| File | DevExpress.BonusSkins.v10.1.dll |
| Function | Additional skins for DevExpress Windows Forms controls |
| Product family | Older DevExpress WinForms components |
| Windows component | No |
| Typical location | The affected application folder or the original DevExpress component directory |
| Historical builds | DevExpress documentation and support material show multiple 10.1 builds |
| Reported architecture | One catalogued build is reported as 32-bit; treat this as build-specific metadata |
What this file does
BonusSkins is a separate DevExpress assembly containing additional visual themes for applications built with DevExpress Windows Forms controls. It is normally loaded alongside other versioned DevExpress assemblies, not as an independent Windows component.
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Historical DevExpress installations placed related files in a component directory similar to:
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C:Program FilesDevExpress 2010.1ComponentsSourcesDevExpress.DLL
A commercial program may also redistribute the required assemblies in its own installation folder. The DLL name alone cannot identify which application installed it.
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The file is not part of Windows, Windows Defender, DirectX, or the Microsoft Visual C++ Redistributable. It should not normally be placed in either C:WindowsSystem32 or C:WindowsSysWOW64.
Error messages you may see
Common symptoms include:
- “The program can’t start because devexpress.bonusskins.v10.1.dll is missing from your computer.”
- “The code execution cannot proceed because devexpress.bonusskins.v10.1.dll was not found.”
- “There was a problem starting devexpress.bonusskins.v10.1.dll.”
- “The specified module could not be found.”
- “Could not load file or assembly ‘DevExpress.BonusSkins.v10.1’.”
- “The system cannot find the file specified.”
- “The file is either not designed to run on Windows or it contains an error.”
The phrase “specified module could not be found” does not always mean the named file itself is absent. A dependent DevExpress assembly, .NET Framework component, or native dependency may be missing instead.
Fix 1: Repair the application that reports the error
This is the safest and most likely solution.
- Close the affected program.
- Press Windows + I.
- Select Apps, then Installed apps on Windows 11. On Windows 10, select Apps and then Apps & features.
- Search for the application that fails.
- Select its three-dot menu or application entry.
- Choose Advanced options, if available.
- Select Repair.
- Start the application again.
If there is no Repair option:
- Open Control Panel.
- Select Programs, then Programs and Features.
- Select the affected application.
- Choose Repair or Change, if offered.
- Follow the installer prompts and restart Windows.
If repair does not restore the file, uninstall and reinstall the application using its original installer, launcher, or publisher-provided package. For a game, use its built-in Verify, Repair, or Verify integrity function before reinstalling the entire game.
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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 matchA successful repair normally restores the missing file together with the other matching DevExpress.*.v10.1.dll assemblies. Do not copy only BonusSkins if the application also needs files such as DevExpress.Utils.v10.1.dll, DevExpress.Data.v10.1.dll, or DevExpress.OfficeSkins.v10.1.dll.
Fix 2: Check Windows Security quarantine
Antivirus software may remove or quarantine an old application file after an update, migration, or scan.
- Open Windows Security from the Start menu.
- Select Virus & threat protection.
- Select Protection history.
- Review recent entries for the application folder or the DevExpress assembly.
- If the file was quarantined, do not immediately choose Restore.
- Confirm that the application came from a trusted publisher and that the installer is genuine.
- Scan the installer and application folder.
- Reinstall from the original source whenever possible.
If Windows Security identifies the file as unsafe, leave it quarantined and obtain a clean installation package. Microsoft notes that Protection History entries are retained for a limited period, so an older quarantine event may no longer appear.
Fix 3: Restore the matching DevExpress package
If you are maintaining an old developer-built application, restore the exact DevExpress release expected by that application. DevExpress 10.1 assemblies are not interchangeable with later major releases merely because their names look similar.
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Use one of these sources:
- The original application installer
- The application developer or publisher
- A trusted deployment archive owned by your organization
- The registered-product download area provided by DevExpress, where the licensed previous version is available
Do not install the current DevExpress package as a drop-in replacement. Assembly versions, dependencies, public APIs, signing, and skin registration can differ.
Some historical records identify a 10.1.5.0 build as approximately 5.28 MB and 32-bit, while DevExpress support material also documents a 10.1.6.0 build. These are reported historical details, not a guarantee that either build is correct for your application.
Fix 4: Check 32-bit and 64-bit compatibility
A 32-bit application normally uses its matching 32-bit managed assemblies even when running on 64-bit Windows. Do not place a DLL in SysWOW64 simply because the computer is 64-bit.
To check the application architecture:
- Start the application if possible.
- Open Task Manager with Ctrl + Shift + Esc.
- Select the Details tab.
- Right-click a column heading and choose Select columns.
- Enable Platform, if your Windows version provides that column.
- Look for the application process.
For a program that will not start, check the publisher’s documentation or ask the developer whether the build is x86, x64, or Any CPU.
Architecture or binary mismatches can produce errors such as:
BadImageFormatException- “The module was expected to contain an assembly manifest”
- “Is not a valid Win32 application”
- “The file is not designed to run on Windows”
The correct response is to obtain the matching application build, not to rename the DLL or substitute another version.
Fix 5: Check .NET Framework and dependent assemblies
This is a managed .NET assembly, so the application may require an older .NET Framework version. The exact requirement depends on the application that uses it.
- Open Control Panel.
- Select Programs, then Turn Windows features on or off.
- Check whether the application documentation requires a particular .NET Framework feature.
- Enable only the documented feature.
- Restart Windows and test the application.
Do not assume that installing Visual C++ Redistributable will repair this file. Visual C++ packages provide Microsoft C and C++ runtime libraries, not the DevExpress BonusSkins assembly. Reinstall a Visual C++ package only when the application’s own documentation or error message identifies it as a prerequisite.
If the file exists but the application still fails, the missing item may be another DevExpress assembly. Developers should inspect project references, binding redirects, the application directory, and the complete inner exception or loader log.
Fix 6: Update or reinstall a related driver only when indicated
A printer, scanner, capture device, or other peripheral may launch an older DevExpress-based utility. In that case, update the driver and the device software from the hardware manufacturer.
- Right-click Start and open Device Manager.
- Expand the relevant category, such as Printers, Imaging devices, Display adapters, or Sound, video and game controllers.
- Right-click the device and select Update driver.
- Choose Search automatically for drivers, or install the manufacturer’s official package.
- If the problem began after an update, open Properties, select the Driver tab, and use Roll Back Driver when available.
- Restart Windows and test the application.
Outbyte Driver Updater can reduce the manual work of hunting through numerous driver versions: its free scan identifies outdated drivers, while driver installation is handled by the full version. It is not a substitute for reinstalling the application that owns this DevExpress assembly.
Fix 7: Repair Windows components only for broader Windows problems
SFC and DISM do not normally restore third-party application files. Use them when Windows itself shows corruption, installers fail, or multiple unrelated applications are malfunctioning.
Open Terminal, PowerShell, or Command Prompt as administrator:
- Right-click Start.
- Select Terminal (Admin) or Command Prompt (Admin).
- Run:
DISM /Online /Cleanup-Image /RestoreHealth
Wait for it to finish, then run:
sfc /scannow
Restart Windows and try the application again. If the application DLL remains missing, return to the application repair or reinstall process.
Manually repeating SFC and DISM can make it difficult to tell what changed. Outbyte PC Repair provides a free scan showing detected problems, while repair actions are performed by the full version. Reinstalling the affected application remains the definitive fix when its DevExpress file is missing.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Fix 8: Use System Restore after a known system change
If the application worked before a recent driver installation, cleanup operation, or system change:
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- Type
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- Select a restore point created before the problem began.
- Review affected programs.
- Select Finish and allow Windows to restart.
System Restore can revert system settings and installed programs without normally removing personal files. It will not reliably replace a missing application DLL if the original application installation is damaged, so reinstalling remains preferable.
Why regsvr32 usually does not apply
Do not use this as a generic repair:
regsvr32 DevExpress.BonusSkins.v10.1.dll
regsvr32 is intended for DLLs that provide a COM registration entry point such as DllRegisterServer. A DevExpress BonusSkins file is normally a managed .NET assembly referenced by the application, not a COM or ActiveX component.
A registration attempt may return “DllRegisterServer was not found.” That does not prove the file is defective. It means the registration method is inappropriate.
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What not to do
Do not:
- Download the DLL from a random file archive.
- Copy it into
System32orSysWOW64. - Mix
v10.1assemblies with newer DevExpress releases. - Disable antivirus protection to force an unknown file into place.
- Use registry cleaners or automated DLL fixers.
- Rename a 32-bit or incompatible DLL.
- Assume the named file is the only missing dependency.
- Install Visual C++ Redistributable without evidence that the application needs it.
The safest source is the original application installer or the matching licensed DevExpress distribution.
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Is this a Windows system file?
No. It is a third-party DevExpress assembly used by applications with DevExpress Windows Forms controls.
Which program installed it?
The DLL name alone cannot identify the owning program. Check the application named in the error, installed applications, the file’s folder, and the original installer.
Should I put it in the application folder?
Only if it came from the application’s trusted installer or verified deployment package and matches the complete required DevExpress assembly set. Do not copy an arbitrary download.
Is it 32-bit or 64-bit?
One historical build is reported as 32-bit, but the required build depends on the application. Match the application and its original DevExpress package.
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Why does the error say “specified module could not be found” when the file exists?
Another dependency may be missing, the version may be wrong, antivirus may be blocking the file, or the application may be loading from a different directory.
What should I provide when asking for help?
Include the complete error text, application name and version, Windows version, application folder, file properties for the DevExpress.* assemblies, application architecture, and any Windows Security or Event Viewer entry.
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