Excel creates duplicate files

I am having an issue with Excel creating a duplicate file when logged in as a user with restricted permissions on our network. If I modify a file while logged in as another user, excel will save the file but will also create a duplicate file with an eight character random name and no file extension. For example if user "Dave" opens a file called test.xls and saves it, in that same folder on the server a file named 296E9E20 will be created. Users are using Windows XP SP3 boxes and the server is running Win 2003. I am not sure why this only happens with Excel.

http://support.microsoft.com/kb/271513/en-us

does that mean it worked or not?
the Restricted permissions is the relevant bit.
although i had the same problem with excel 97 on a win 2k work station and nothing fixed it until it was upgraded to xp ,office 2003