Step 10 says:
Attempt to open the file created by other user:
The file cannot be opened and the logged on user must be prompted indicating so.
Is it an acceptable behavior for TC2, if our application does allow to
open files created by other users, but will deny any attempts to save
changes for such a file That means that user won't be able to edit other users' files, although this will be forbidden not on file opening but on file saving operation.
Or should we still need to change the behavior of our product not to allow to even open files that belong to other users

TC2 - Our application can open files created by other users but will deny saving them
EGutierrez91
See the following thread to see if it will answer your question:
http://forums.microsoft.com/MSDN/ShowPost.aspx PostID=1045084&SiteID=1&mode=1
GregMaxey