The problem is Windows (and a programmer with a short memory), isn't that most always the case? Since the full path contained a space in it, there needed to be quotes around it before the system would understand it.

Not:
Qt Code:
  1. QString sFullPath( "C:\\Program Files\\Net3Helper\\Net3Helper.exe" );
  2. QProcess::startDetached( sFullPath );
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but,
Qt Code:
  1. QString sFullPath( "\"C:\\Program Files\\Net3Helper\\Net3Helper.exe\"" );
  2. QProcess::startDetached( sFullPath );
To copy to clipboard, switch view to plain text mode 
Thanks for looking at this Marcel!