Seeking Reader/Viewer for *.prt.1 files

Hello! My name is Paul and I am a technical writer, not an engineer. I joined this forum because I'm looking for information that I hope you all can help me find.

As part of a documentation project, I've been handed a number of files that all have filenames of the form ######_####.prt.1. None of my applications can open these files, but I was able to get in using a small utility that views files at the code level. There, I found the following line:

That's what led me here. I'm assuming that Wildfire is the application that was used to develop these files.

I don't need to edit the files; I just need to read them. Can any of you recommend a viewer/reader for files of this format?

NOTE: I did do a little research before posting here. I downloaded the Solidworks eDrawing Viewer, but it wasn't able to open the files either.

Any help would be much appreciated!