DWG file association to BricsCAD

Primary I use BC, but somtimes is situations when I must again use AC2009LT (multiline etc...).

Autodesk software is very "agressive" to take assotions of DWG and other cad file.

Is some way how to make/set BC so also "agressive" to take assotiation back?

 

Set with -> Windows Explorer -> "Open with" -> Choose program..." -> "Always use this program to open these files" isn't solution, because in next start of AC is this set away.

 

I thing, helpfully maybe icon (created as standard during installation) in start menu, BC group something like "Reassociate file to BricsCAD", dialog window like is it in installation proces.