Vscapi.dll -

When registered, vscapi.dll adds entries under:

HKEY_CLASSES_ROOT\CLSID\...\InprocServer32

These COM entries allow applications to instantiate VDS objects.

| Error Type | Likely Cause | |------------|---------------| | Missing DLL | Uninstalling a virtual machine or storage app removed the file | | Registration failure | The DLL is present but not registered with COM (regsvr32) | | Version mismatch | An outdated or newer version of the DLL conflicts with a legacy app | | Access denied | The application lacks administrator privileges to call VDS APIs | | Malware infection | A fake vscapi.dll replaces the original or sits in a wrong folder | vscapi.dll

Because file names can be spoofed, always verify the digital signature.

Key functions exported by vscapi.dll include: When registered, vscapi

Critical Security Note: Because this DLL exists primarily in server environments, any instance found on a standard Windows 10/11 home PC, especially outside the above directories, or with a missing Microsoft signature, could be malware disguised as vscapi.dll.

On a 64-bit version of Windows Server, the correct location for vscapi.dll is: These COM entries allow applications to instantiate VDS

C:\Program Files\Microsoft Virtual Server\

or

C:\Windows\System32\vds.exe\ (as a supporting file)

In some SDK installations, it may appear under:

C:\Program Files (x86)\Windows Kits\10\bin\