got to the folder. alternate click and select properties. Then go to the security tab. Once there, if you are an admin, you can set specific permissions to the other users on that machine. Another option is if you have Encrption available on your computer, is to encrypt the folder while you are logged in. Other users will not be able to view anything that you have encrypted.
All of this only works if the others involved are not local admins to the machine. If they are, then youare SOL for the time. Cause i don't know the app you are referencing...