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Did a clean windows 10 install last week and then imported my GoG folder into GoG Galaxy. After this i had 241 new "GameName []" folders in my StartMenuRoot.
Since the win10 start menu's "all apps" only allows top level folders, flattening any subfolders, i see why gog did this, but i use "classic shell"/"start10" start menu & fences!
So i've written a script that moves all these folders into an "All Progams\" folder, plus it extracts the primary shortcut to start the games/expansions and copies them into an adjacent "All Programs\GoG" folder for quick access:

Explanation on how to use : read the first 4 lines of the script.

(And here is one that creates shortcuts for all steam games :
Post edited February 18, 2017 by bernstein82
I cannot believe nobody took the time to write back to thank you.
this helped me a lot, thank you very much
Also remember that Windows 10 cannot have more than 500 items in the menu, or at least that was so two months ago. A problem discovered before the release of the whole OS.
Will keep your script at hand, just in case. Thanks for sharing your work!!
Post edited January 25, 2020 by Carradice
The reason you have a problem is because you have so much installed. Just keep the installers and install what you actually use.