Make the handling of .mot and .sto (especially old versions) more explicit.
Make the handling of .mot and .sto (especially old versions) more explicit.

opensim-org/opensim-core,opensim-org/opensim-core,opensim-org/opensim-core,opensim-org/opensim-core,opensim-org/opensim-core,opensim-org/opensim-core,opensim-org/opensim-core