QProcess error Using Arguments Qt 4.5

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I have a similar problem, but it's not caused by a trailing space.

This works:

proc = new QProcess( parent );
proc->start( "/home/user/path/to/prog/myprogram.exe -a -b -c" );

proc = new QProcess( parent );
proc->start( "/home/user/path/to/prog/myprogram.exe -a -b -c" );

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This doesn't work:

proc = new QProcess( parent );
proc->setWorkingDirectory( "/home/user/path/to/prog" );
proc->start( "myprogram.exe -a -b -c" );

proc = new QProcess( parent );
proc->setWorkingDirectory( "/home/user/path/to/prog" );
proc->start( "myprogram.exe -a -b -c" );

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Adding a trailing '/' to the path in setWorkingDirectory makes no difference.

The weirdest thing is, if I change "myprogram.exe" to "ls", for instance, then "ls" works and returns the contents of /home/user/path/to/prog

What am I missing ?