A ql$ file extension is related to the Microsoft compressed QLB file format.
QL$ file extension - Microsoft compressed QLB data
What is ql$ file? How to open ql$ files?
File type specification:
The ql$ file is the same as qlb, but uses compression. Decompress with UNPACK.EXE
The ql$ file stores compressed Quick library used with Microsoft QB.EXE, QBX.EXE, VBDOS.EXE, QuickC 1.0.