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On the popen() line I am receiving an error message that the "file or directory does not exist". I'm not sure what I'm doing wrong here. Could it be permissions? Perhaps it is looking for a path relative to the working directory (not sure what that would be in this case)?
They may be using an older version of Windows which does have a start.exe binary.
Use popen or perhaps proc_open to run php.exe directly.
Another option is to just include that file directly inside your script. You can set up $argv and $argc to fake a command-line invocation.