Error "Invalid DOS path" of VSS

I installed VSS for my company a few weeks ago and don't mistake me, I
don't like VSS but have to follow company policy. However, even this
simple version control system brought me some trouble.

I was about to add some new folders to VSS repository, but every time
an operation, any operation, succeeded VSS prompted that "Invalid DOS
path, unable to acesss ...\AccessLog.txt'. This is really annoying
when manupulating multiple files.

At first I thought it was because of permission granted, so I logoned
on the server machine with administrative rights but the problem was
still there. I read the error description carefully and found it
referred to a folder that didn't exist on my own client pc but on the
VSS server. And since it is written in local path such as "E:\Program
Files\Visual Studio\VSS\log\AccessLog.txt", certainly it can't access
that path. Besides, VSS client won't access that folder on the server
since it is not written in UNC.

This should be a bug of VSS, my version is 6.0C.