Problem with RProcess::Create()

Hi,
I am using Series60 3rd Edition for my development. In my application I am trying to create one process using RProcess class. According to the symbian class document, the default path where the RProcess::Create() searches the executable is \System\Programs. But when I was trying to call the RProcess::Create() using the the executable lying in the above mentioned path, it returns error "-1". Also I placed my executable "*.exe" in phone's C,E drives i.e. c:\*.exe and e:\*.exe and when I called RProcess::Create() using the above mentioned paths again it gives me error "-1". I have verified the error on dvice and emulator both.
I have tested the same application in my friends PC, who is having different hardware config. but its working fine in his machine.

Also if we are executing our emulator in debugging mode and placed our "*.exe" in
release\winscw\udeb folder, then its working fine if we mentioned the "*.exe" file name only in RProcess:Create().
Why this strange behavior?
Any comment/help in this regard is really appreciable.
Thxs.