How to Restore Default File Extension Type Associations in Windows 8 and 8.1
This tutorial will allow you to restore the default registry entries and program associations for the file extension type and protocol of your choice in Windows 8, Windows RT, Windows 8.1, and Windows RT 8.1.
This can be helpful for example when a file extension type opens with the wrong program by default, has the wrong icon, or is missing or corrupted in the registry. Downloading the .reg file for the selected file extension below, will restore that file extension back to default for all of these items above.
Default program associations for file extensions are a per user setting by default, so you will need to be logged on to the effected user account to...