asc to fbx conversion more or less represents export of rendered scene in 3ds Max to FBX format, which is a common way to transfer the designs to another too, considering that FBX is one of the most popular format for exchange purposes.
As with pretty much every 3ds Max format, it's always best to use the original software because 3ds formats are rarely supported in 3rd party software.
Updated: October 19, 2023