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Thread: All file extensions changed on my PC. Is it a virus?

  1. #1
    Doug_72's Avatar
    Doug_72 is offline Senior Member
    Join Date
    Jul 2008

    Default 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?

    Please help.

  2. #2
    HappyAndyK's Avatar
    HappyAndyK is offline Site Administrator
    Join Date
    Jun 2008


    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:

    HKEY_CURRENT_USER\Software\Microsoft\Windows\Curre ntVersion\Explorer\FileExts

    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.
    Doug_72 likes this.

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