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    Ah that very last point, ApplicationCompany, did the trick for me. I’ll try to look up what this key is supposed to be caching and see if I can write up an answer from this.
    – Cimbali
    Commented Apr 22, 2021 at 19:45
  • Worked for me - thank you! - though my chosen app shows up FIFTH after Notepad and all the internet browsers I have on the system. -sigh- Making the Windows GUI work for you in seven steps, modifying the Registry and requiring a reboot ;-(
    – cniggeler
    Commented Apr 5, 2022 at 14:50
  • The app friendlyname & company name gave me the clue I needed, by defining a CompanyName and FileDescription when building using pyinstaller, things now show up as desired in the openwith menu.
    – Hugoagogo
    Commented May 25, 2022 at 2:54