There are several versions of FBX format as well. You mentioned your file is quite old. There is a free utility by Autodesk to convert formats:

https://www.autodesk.com/developer-network/platform-technologies/fbx-converter-archives

"FBX Converter Archives

Transfer files from one file format to another quickly and easily with the FBX Converter. This utility enables you to convert OBJ, DXF™, DAE, and 3DS files to or from multiple versions of the FBX format. "

Eternal Hobbyist