Well you can load b3d files in Ultimate Unwrap and then export to other file formats (eg. 3ds) from there. Note that lightmaps aren't supported. Brad asked me questions about use of the second UV set a week ago so he may be working on adding that (and thus lightmaps) but at the moment Ultimate Unwrap only supports the main texture channel.
You can load 3ds files in CharacterFX but I wouldn't really recommend it. Depending on the source, loading 3ds files can make CharacterFX behave pretty flaky. I generally export from Milkshape to Milkshape ASCII format (which CharacterFX can import.)
You can load 3ds files in CharacterFX but I wouldn't really recommend it. Depending on the source, loading 3ds files can make CharacterFX behave pretty flaky. I generally export from Milkshape to Milkshape ASCII format (which CharacterFX can import.)