Retrieves the name of the executable file associated with the specified file name
_WinAPI_FindExecutable ( $sFileName [, $sDirectory = ""] )
|$sFileName||Fully qualified path to existing file|
|$sDirectory||[optional] Default directory|
|Success:||The Full path to the executable file started when an "open" by association is run on the file specified|
|Failure:||Empty string if no association was found, @extended contains an error code as $SE_ERR_*|
$SE_ERR_* constants require #include <APIShellExConstants.au3>
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