Setting MODTRAN Exe Prgrammatically

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Pass Mod5.SetMODTRANExe an actual path for the executable
2.
3.

What is the expected output? What do you see instead?
Executable will be set in the same way that it would if using the uigetfile. 
However, it crashes because the MODTRANpath variable is not set in this case. 
(Also there are some hardcoded file separators which causes issues when setting 
the BMNAME.) 

What version of the product are you using? On what operating system?
Mod5Rev98f4d01ebf2a

Please provide any additional information below.

Original issue reported on code.google.com by [email protected] on 17 Oct 2012 at 10:07