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Thread: How to stop Win10 resetting default filetypes.

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    Senior Member MrRadio's Avatar
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    Default How to stop Win10 resetting default filetypes.

    I have set various photography apps to be the default for certain filetypes but every month to six weeks Win10 resets them to M'soft defaults and it's a pain in the seating structure. Can I somehow lock my selections in?



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    It usually happens after Windows updates.

    I get the same thing happening.

    Most annoying.

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    You could try setting something through Group Police (gpedit.msc)
    Perhaps edit an existing GPO - open group policy management and select one, or create a new GPO according your Organization Unit
    Navigate User Configuration > Administration Templates > Control Panel Settings then right click on Folder Options and Navigate to New > Open With
    Type in the extension in the File Extension and then put in the path to the program you want to have open the file. Then optionally tick “Set as default” and press “OK”

    Alternatively use Regedit

    The "user choice" of the default file handler is located in the key
    HKEY_CURRENT_USER\Software\Microsoft\Windows\Curre ntVersion\Explorer\FileExts\[extension here]\UserChoice

    Unfortunately, this key is protected by some mystery hashing algorithm that incorporates the extension, your user account, and the program in some convoluted way.

    Fortunately, we can, of course, set the default file handler by brutally deleting the other file handlers with extreme prejudice, making windows think that your program is the only available program capable of opening that type of file, thereby making it default.

    These are located in:
    HKCU\Software\Microsoft\Windows\CurrentVersion\Exp lorer\FileExts\[extension here]\OpenWithList
    HKCR\[extension here]\OpenWithList
    In hindsight I should have posted my Facebook status as: "I've blown the head gasket on my 1997 XR3i" rather than "I've just buggered a 14 year old escort".
    The police still haven't seen the funny side, my lap top's been confiscated and the wife has gone off to her mum's.

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    Above methods may work,... but setting the default file associations is a little different in Windows 10 to what people may have been used to previously.

    Details are exported into an XML format and then applied to the computer. There's guides out there,.. use dism to export them into an XML. Put that file somewhere on the target computer and then adjust a policy to point to it.

    Here's a couple of links to get you going,...




    These talk about doing it in the domain environment but the same approach should apply on a standalone computer.

    Jim.....

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    It now appears that Windows Update is not the culprit but more likely to be Windows Defender which took offence to some software I was extracting and each time it acted all my default programs reverted to the Windows defaults. Solution? Piss Defender off.

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