Volume Shadow Copy Service on 64bit OSes (Vista x64 & Windows 7 x64) from 32-bit process.

Question

Problem description:  cannot use Volume Shadow Copy Service on 64bit OSes (Vista x64 & Windows 7 x64) from 32-bit process.

 

Test 32-bit program was build using Windows7 SDK.  Here it’s logs:

 

// on Vista x64:

CoInitialize(NULL) OK

CreateVssBackupComponents() OK

InitializeForBackup() failed, 0x8000FFFF                 // E_UNEXPECTED

 

// on Windows7 x64:

CoInitialize(NULL) OK

CreateVssBackupComponents() OK

InitializeForBackup() failed, 0x80042302                 // VSS_E_UNEXPECTED

 

The same program, built with Windows7 SDK for 64-bit, works fine both on Vista and Windows 7  x64.

 

After test program failed, there were  some error messages in the Applications log (Event Viewer/windows logs/Application):

 

EventID 8193             // on Windows7 & Vista

«Volume Shadow Copy Service error: Unexpected error calling routine CoCreateInstance. hr = 0x80040154, Class not registered . Operation: Instantiating VSS server»

 

EventID 22                 // on Windows 7

«Volume Shadow Copy Service error: A critical component required by the Volume Shadow Copy service is not registered. This might happened if an error occurred during Windows setup or during installation of a Shadow Copy provider. The error returned from CoCreateInstance on class with CLSID {e579ab5f-1cc4-44b4-bed9-de0991ff0623} and Name IVssCoordinatorEx2 is [0x80040154, Class not registered ]. Operation: Instantiating VSS server»

 

EventID 32                 // on Vista x64

Volume Shadow Copy Service error: The VSS Coordinator class is not registered. This may be caused due to a setup failure or as a result of an application's installer or uninstaller. Operation: Instantiating VSS server

 

 

The question: is it possible to use VSS from 32-bit process on 64-bit OS? How can we do that?

Answer 1

I hope the answer is as clear as your question.

---

Software to help you build a better store

Answer 2

i got the same error trying to use VMware Converter 4.0 on windows 7 64 bit system

Answer 3

I recieved answer from MS Saying that this is not possible, and only x64 processes can use that service.