Okay, we’ve got a Centerline Trace tutorial for Illustrator here:
I think that will work if you have a lot of files to process. Since those are hairline, you probably won’t have to make adjustments to the line width.
If it was just one or two files, I would suggest just dragging and deleting the doubled lines individually, but they’re impossible to determine until you burn them and wind up overburning.
Try the Centerline Trace on one and see if it works.
