Not sure I follow 100%, but:
Set Default programs - http://www.sevenforums.com/tutorials/2630-default-programs-set-programs-default-associations.html *(*A default program is the program that Windows 7 uses when you open a particular type of file extension. This will show you how to set a program as the default for selected or all file types and protocols it can open.
These Default Programs association settings are a per user setting and not applied to all users.)
OR
Set Default associations - http://www.sevenforums.com/tutorials/19449-default-file-type-associations-restore.html *(*The downloads below will allow you to restore the Windows 7 default registry entries and program associations of the selected file extension type. )
I think one or the other will hopefully do the trick
If Ive misunderstood, or that doesn't help, please post back with as much extra info as possible, and maybe post a screenshot to show the problem, and hopefully someone else will assist further.