Originally Posted by EmmEff
If you or the original poster can identify the differences (or send an example of a file that doesn't open), I'd be happy to write an app/script to massage the XML output in such a way that it'd be compatible with MapSource.
I'm away from home right now so I'll have to remember to come back to this when I return. I'll drop you a PM.
I don't think I have any of the troublesome .gpx files anymore, but I think I can remember the project those shapefiles came from. Some GIS guys in the modelling and customization end of things (think: coders) were explaining where the errors were usually found that caused MapSource to choke. Their solution, if I remember correctly, involved stripping out the author and time