Dear Team of B1 Archiver,
I am archiving every day and recently ame across your free B1 Archiver.
After installation your tutorial pops up - including some images where
B1 handles JPEG images and MP3 songs.
Both formats an be compressed losslessly with free and open source formats
so I want to suggest you to add both to your B1 archive format.
The programs are called packJPG (LGPL like 7-Zip) and packMP3 (GPL).
Both an be found here:
http://www.matthiasstirner.com/And I can confirm that both are truly lossless - feel free to test yourself.
What do you think?