That's strange, try this one:
<?xml version='1.0' encoding='Windows-1252'?>
<SimBase.Document Type='Launch' version='1,0'>
<Descr>Launch</Descr>
<Filename>exe.xml</Filename>
<Disabled>False</Disabled>
<Launch.ManualLoad>False</Launch.ManualLoad>
<Launch.Addon>
<Name>Couatl</Name>
<Disabled>False</Disabled>
<ManualLoad>False</ManualLoad>
<Path>fsdreamteam\couatl\couatl.exe</Path>
</Launch.Addon>
</SimBase.Document>
Paste this into a new file, and save it as EXE.XML into your %APPDATA%\Microsoft\FSX folder