OOP
From Just Solve the File Format Problem
OOP is a menu-driven compressed archiving utility for DOS, developed by Tony M. Brown / TonyTown Software Ltd.
OOP format seems to be byte-for-byte identical to that of AMG v2.2/v2.3. OOP is evidently either derived from, or a clone of, AMG v2.3.
Software
- OOP v2.3
- AMG - Refer to AMG (compressed archive)#Software