RSX to RT-11 OBJ file format

I would like some help. I have a very old version of ODT.OBJ from an RSX-11 system. I MUST use this same old version to reproduce an old executable file, but I want to LINK under RT-11. The other file is in a source MAC file which does not use any system calls, so I can use RT-11 to run MACRO.SAV and produce a FOO.OBJ has the RSX-11 file format for RSX-11 and I can't do the LINK under RT-11. Can anyone suggest a way to convert it to an RT-11 file format? NOTE: I am not asking about the file structure of the directory, but the actual file format of ODT.OBJ itself. I can attach ODT.OBJ as a file for anyone who might be able to send me back the other version? It is already on a floppy with an MS-DOS file structure and I just used PUTR to copy it the the RT-11 system, but can't do the LINK under RT-11 and I don't want to switch to RSX-11. Sincerely yours, Jerome Fine