2 answers

• 
  Mike Robinson 10 months ago

  The problem could simply be due to dots and dashes,
  ie. file named "part-model.stp" will not load
  change file name to: "part_model.stp"
  and try again.

  good luck........Mike

• 
  yogaraj 9 months ago

  hi, may be the part name having the space. ex: part model.stp or part model.igs.
  Remove the space, and try it.