i try downloaded the following files and copy the files to registry.
Directory Extension Fix (Restores defaults to HKCR\Directory)
Drive Association Fix (Restores default settings for hard drives)
Folder Association Fix (Restore default associations for File Folders)
LNK (Shortcut) File Association Fix (Restores Default Shortcut Behavior)
Several other things might be corrupted too..
Does regedit.exe still work? File associations are kept in the HKEY_CLASSES_ROOT registry hive.
Does IE or FF still work?
"...to give correctly is to give them what they need from us, for it would not be skillful to bring gifts to anyone that are in no way needed." --Socrates