.NET Problem finding path to command line executable

[drken567]

I'm trying to execute a command line from my C++ .NET code/WinXP. The program (call it myprog.exe) is located in a directory (C:\mypath) which is included in the system 'path' environment variable. From a DOS window, I can do the following: "C:\any_other_path>myprog option1 option2...." with no problem. From my code, I've tried using the old 'system()' C-style call (only works if I specify it as "system("c:\mypath\myprog options..."); then I tried using the .NET versions, like so:
Process* compile = new Process();
compile->StartInfo->FileName = "myprog";
compile->StartInfo->Arguments = "options....";
compile->Start();
compile->WaitForExit();

but this failed to find 'myprog' even with it in the system Path....

Then tried running it using "cmd.exe" as the StartInfo->FileName = "cmd.exe" and "myprog options..." as the Arguments. For some reason, no matter what I've tried it fails if not specifed as "C:\mypath\myprog". I expect it would work if I dumped the .exe into c:\system\windows32.