Here is MS-DOS tools for investigation object formats:
- omfview - OBJ/LIB files in OMF format.
 - rdfview - OBJ files in RDOFF2 format (NASM version 0.98.39).
 
    omfview objfile.obj
    rdfview rdffile.rdf
or
    omfview "Long file name.obj"
    rdfview "Long file name.rdf"
OMFView :
RDFView :
Requires System2 library:
https://github.com/DosWorld/libsystem2
You need Turbo Pascal and my small make in path. Just type:
    make
MIT License