File Extension QL$ File Format MS Compressed QLB QL$ stands for MS Compressed QLB. This was last updated in March 2012 By Margaret Rouse Browse File Extensions Alphabetically: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z # Ask a Question. Find an Answer. Ask your peers a question about this file extension. Ask a Question Get Prestige Elite 9QL tablet running again Data deduplication and compression What is the range an image can be compressed?