Hi, this is to answer Chris and continue a thread started in 2020 ..
it says permission denied when I was trying to answer the initial thead, feel free to move this to the right place ! thx
to answer Chris : I could not find the key you told me to look for in the registry

also as a memo :

running windows 7, voobly, I click open the colossus lobby (for TA)
from this page :
https://www.voobly.com/games/lobby/60

voobly opens, and display a message saying there is :

" game detection error
Total Anihilation was not found on your computer!
you must install the game ....
Do you want to run diagnostic .. "

I press Yes
then It says : error game diagnostic not supported for this game

Any Idea on how I could fix this ? initial goal being to play lan with friends, if you have any other ida on how to achieve this, I am happy to try them on !

thank for your help

Nicolas

Please search the following GUID in registry: {99797420-F5F5-11CF-9827-00A0241496C8}
Run > type "regedit" > run as administrator > CTRL + F to to search