requestedDisplayResolution is stuck on high

I opened the XML file (application descriptor file) generated when I export to air for desktop, I added this line

  <requestedDisplayResolution>high</requestedDisplayResolution>

Which worked but I want to change it back, so I changed it to standard... I also tried deleting the line. Every time I export now, that line regenerates itself into the XML file and my app is forced to export in high resolution.

I'm not really sure what to do. Can someone offer me some help please? I just want to go back to standard definition. High lags too much.