Windows 10: App Defaults Unstable

Discus and support App Defaults Unstable in Windows 10 Customization to solve the problem; Whenever we try to open a document that is unusual, Windows 10 changes our PDFs to open in TWINUI. HTMLs change to "Launch Windows App." This keeps... Discussion in 'Windows 10 Customization' started by GregRickard, Sep 9, 2018.

  1. App Defaults Unstable

    Whenever we try to open a document that is unusual, Windows 10 changes our PDFs to open in TWINUI. HTMLs change to "Launch Windows App."

    This keeps happening and wastes a lot of our work time, repeatedly having to fix it. Internet research suggests that it is a Windows 10 bug.

    Any help would be greatly appreciated.

    GregRickard, Sep 9, 2018
  2. kormath Win User

    Lost default photo viewer after profile rebuild

    Thanks Brink. I've tried those steps before i started searching Google. After the profile rebuild i don't have the Photo app listed to choose to make it default in either the system settings for default apps or the Open With option.

    I can't even find it doing a search. Seems to have been removed somehow with the profile rebuild, which doesn't make sense.

    Might be helpful to list what i've done *Smile I've done the open with check, the choose default program in the system menu, tried that in device manager default programs also. I've checked the programs and features Turn windows features on/off and it's not listed there (never thought it was but that was a suggestion), searched the MS Store, it's not listed there either.

    I don't like playing in the registry unless i have defined steps and haven't found anything for this yet, just the Win7 version like in my OP.
    kormath, Sep 9, 2018
  3. How to set Microsoft Photos App as default


    We understand the issue you are facing and will assist you.

    I suggest you to follow the steps provided below and check if it helps.

    • Navigate to Start>Settings>System.
    • In the left pane, click on Default Apps.
    • In the right pane, click on Choose default apps by file type.
    • Set the default App to open .jpg files and check for status.

    Hope this helps. Keep us posted on the status for further assistance.
    Eeshwar Kumar, Sep 9, 2018
  4. App Defaults Unstable

    Default apps are not working in Windows 10


    As you are facing issues with accessing the default apps on your computer, let us try the troubleshooting steps and check if it helps.

    Step 1: I suggest you to run the
    Windows Store Apps troubleshooter.

    Windows Store Apps Troubleshooter,
    troubleshoots problems that may prevent Windows Store Apps from working correctly.

    Run the troubleshooter for Windows apps

    Step 2: I suggest you to install all the pending updates on your device and check if it helps.


    • Connect to the internet.
    • Press Windows key and type updates.
    • Click on Check for updates.
    • Under Windows Updates, click on Check for updates.
    • Try to install the updates being shown.

    Hope it helps. Get back to us with an updated status of accessing the default apps for further assistance.

    Thank you.
    Deepika Gowda, Sep 9, 2018

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