Cannot launch external exe

Hi,
I have to launch and external exe.
The exe "ComputeRay" is working when I launch it from the command window as shown below.
But when I try to launch it with system ("ComputeRay") I get the error file not found (-3).
How could I make it work?

I may be wrong, but it's my opinion that using two consecutive calls to system () is equivalent to open a command prompt, call the exe, closing the window, opening a new command prompt and calling the other program.
The easiest solution could be to add the last call inside the batch file make one call only to system. Alternatively you could try editing environment variables like PATH with _putenv () function. You could also try to edit _default.pif file (or whichever is its equivalent in Win7/8 OSs) as described in the help for system ().The last resource could be to permanently set environment variables in your system as described in this guide.
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