Cannot execute sourcesafe commands

Is there a solution to the issue with SVCS running Sourcesafe commands?
e.g. I always get:
--- Error: can't execute '"C:\Program Files\Microsoft Visual Studio\Common\VSS\win32\Ss.exe" CP $/"xxxx" -I-'.
However, the Sourcesafe explorer always works and all the other commands use the same path.
My system is Windows XP and uVision 2.31

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