Solving files association with the cc2019 update, my solution and it finally worked.

so regedit for associating ai and psd files to cc2019 and not XD or anything else :

Computer\HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.ai\OpenWithList

Computer\HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.psd\OpenWithList

for both double click the default (mine were just blank), of course before doing this check that the paths to the exe are the same than mine.

in the value data for illustrator copy paste this : "C:\Program Files\Adobe\Adobe Illustrator CC 2019\Support Files\Contents\Windows\Illustrator.exe" "%1"

in the value data for photoshop copy paste this : "C:\Program Files\Adobe\Adobe Photoshop CC 2019\Photoshop.exe" "%1"

see images underneath :

and now my psd and ai files are associated with cc2019 hope this will help.