   custom templates, binary format, and GUID's
  I''m trying to add custom templates to .x files and then save them in binary format, with no luck.  If I define the template in the .x file, it won''t open in convx.exe or mview.exe.  If I define the template in my program then the files will open correctly but when I save the file in either binary or text format it strips out all of my custom data.  I''m afraid to ask...what will I need to do to save x files containing custom data to binary format?  Are their any utilities that will do this?  Or articles on the subject?  The MS docs make it look possible, but it also looks like a R.P.A..ALSO, the GUID numbers necessary in custom templates...ex.,  , how do you generate those to insure uniqueness?  I can''t find anything about this in the SDK.THANKS. 