ERROR_SHARING_VIOLATION when trying to read timestamp from network shared file

I have to show the timestamp (change time) für an EXE within the program, and this works if the file ist called from the local hard drive. When called from a network share, I receive an error. When examining the "properties" of the shared file, I am owner, and I have full access.

This is the code:

STDMETHODIMP CKonfiguration::GetFileChangeTime(/*[in]*/ BSTR bsDateiMitPfad, /*[out]*/ BSTR * bsZeitstempel)
{
	*bsZeitstempel = NULL;

	// unsinnigen Dateinamen abfangen
	if (SysStringLen(bsDateiMitPfad) <= 1)
		return S_FALSE;

	HANDLE hFile = CreateFile(bsDateiMitPfad, GENERIC_READ, 0, NULL, OPEN_EXISTING, 0, NULL);
	DWORD dwLastError = GetLastError();

	if (hFile == INVALID_HANDLE_VALUE)
	{
		return S_FALSE;
	}

	FILETIME ftCreationTime, ftLastAccessTime, ftLastWriteTime, ftLocal;
	BOOL bSuccess = GetFileTime(hFile, &ftCreationTime, &ftLastAccessTime, &ftLastWriteTime);
	dwLastError = GetLastError();
	CloseHandle(hFile);

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CreateFile gives me INVALID_HANDLE_VALUE, and the LastError is ERROR_SHARING_VIOLATION. The call is from within the EXE herself, she tries to find out her own timestamp. GetFileTime must be called with a file handle opened with GENERIC_READ says the documentation, so this is no point for further fiddling.

The server where the share is physically located is a Windows Server 2003 and in the same domain as the client accessing it.

This is VB6, but I had to put it into the .NET zone, because there is no other fitting any more :-(

Any ideas ?