OBJ file extension - Intel (Object Module Format) relocatable object module
What is obj file? How to open obj files?
File type specification:
The obj file extension is associated with the Intel Object Module Format.
The Relocatable Object Module Format is an object file format used primarily for software intended to run on Intel 80x86 microprocessors.
It was originally developed by Intel under the name Object Module Format, and is perhaps best known to MS-DOS users as a *.obj file. It has since been standardized by the Tool Interface Standards Committee.
It seems to be obsolete product.