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I came across an interesting DOS based program called GEOCONV

GeoConv is a coordinate conversion program, which converts between different coordinate file formats, coordinate types and datums. GeoConv is written by Eino Uikkanen. It's a nifty freeware tool that perfroms batch conversion (it only works in batch mode). However the real value for me is the ability to perform filtering, such as:

• Reduce the number of waypoints in the reduced track/route (REDUCEPOINTCOUNT, REDUCEMAXERROR, REDUCEPOINTVIEW)
  
• Fix tracks by substituting track breaks with straight lines (FIXTRACK)
• Specify the maximum distance in kilometers of trackpoints from the reference point (MAXDIST, FROMPOINT, FROMCRDTYPE)
• Provide latitude and longitude ranges to limit the trackpoints that are output to the bounding box defined (LATRANGE, LONRANGE, RNGCRDTYPE)
• but I encountered some errors. I am simply trying to perform a trackpoint reduction on a GPX file.

I encountered a few problems with the trackpoint reduction:

• It appears to fail with more than 112 track points in a track segment.
  
• Breaking up the GPX file into segments of less than 113 trackpoints seem to work up to a limit that I have yet to figure out.
  
• For example, a test file of 2500+ trackpoint broken up into into 28 segments of 90 trackpoints or less fails.

As a followup, I contacted the author with some test cases. He resonded promptly with a corrected version (GEOCONV version 13.02.2006). Well done Eino!