[Xastir] Format for .geo files

[RileyC]

I'm working on getting USGS offline maps, and I'm having problems bringing
them up in Xastir.  Is there a format documented for the indexing of the
maps?

The link in the documentation is broken:
http://data.geocomm.com/quadindex/

I've got the USGS index files that point to the Geopdfs, and can convert
them so they will work like the link mentions, but I'm unsure how to format
them.

If I can get it working I can share my script.

Thanks!

Riley
Kf4emz