Runas only works for executables, not files or folders. There is no way of opening a file if you do not have permission to it. If the user is an administrator and you want to frequently use it, add Administrators then both can. Having Administrator only gives you no access unless you logon as administrator. To find out what permissions you have under Windows XP, goto the security tab, click advanced and effective permissions. Click select and type in a username and click ok. The permissions that they person has will be displayed.