Can you export as STL binary file? (Not STL ascii)

I want to export to STL binary, is this possible in hypermesh? I am trying to send an STL file of my model to a friend. When I export it as STL I can't open in other software to see if the file works. These include SolidThinking and even HyperMesh itself!!! When trying to open the STL ascii file in SolidThinking it doesn't work, is this because it's in ascii file? An error file comes up saying 'save invalid elements to usermark?'. It is quite a large file (8.1MB), is this the problem?

Also, I want to export geometry as a STEP file but it can't saying 'no geometric entities present for export'.

Any help is much appriciated