O yes, I finally found where are damn associations in windows 
Totaly strange place but all custom users associations are here:
When open that location in registry editor you'll see big list of all extensions and their default opening programs...
Totaly strange place but all custom users associations are here:
Code:
[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts]When open that location in registry editor you'll see big list of all extensions and their default opening programs...