How to use TortoiseMerge with Visual SourceSafe 2005?

I tried by setting up a custom editor for "File Difference" in Tools->Options->Custom Editors with the command line: "tortoiseproc /command:diff /path:%1 /path2:%2". TortoiseMerge launches but it can't find the files to compare. The files to compare should be in a temp folder but they aren't there. SourceSafe isn't making the files available.

Has anyone succesfully used Tortoise to diff and merge files in SourceSafe?

A theory I have for my problem: SourceSafe incorrectly detects that Tortoise has exited and finished its operations just after it called the command for Tortoise to start and im开发者_StackOverflow中文版mediately deletes the temp files it just created (if they ever got created). Even though I have this theory, I don't have a solution.

Use

TortoiseMerge.exe %1 %2

instead. TortoiseProc only works on svn working copies.