- 1 Post By HappyAndyK
26th September 2016, 10:35 #1
All file extensions changed on my PC. Is it a virus?
All my file extensions have been changed to PDF, along with default programs. Is it a virus?
26th September 2016, 12:06 #2
In Windows 10, open Settings > System > Default apps.
Scroll down till you see Reset to Microsoft recommended defaults and click on Reset.
If you are using Windows 8 or Windows 7, you will see a similar setting somewhere in Control Panel > Default Programs.
If this does not help, create a system restore point first and then try this:
Open regedit and navigate to the following key:
Expand FileExts. Here you will see a list of file extension folders. You will have to expand each of them, one after the other, and IF you see a UserChoice folder under it, delete the UserChoice folder.
Else you can download File Association Fixer v2 for Windows 10/8 and restore each file association manually.
Having done this do remember to scan your PC with your antivirus software.