<object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" codebase="http://fpdownload.macromedia.com/pub/shockwave/cabs/flash/swflash.cab# version=8,0,0,0" width="100%" height="100%">
<param name="movie" value="file:///C|/Users/user/Desktop/project scale/Main.swf" />
<param name="quality" value="high" />
<param name="LOOP" value="false">
<param name="SCALE" value="exactfit">
<embed src="file:///C|/Users/user/Desktop/project scale/Main.swf" width="100%" type="application/x-shockwave-flash" height="100%" quality="high" pluginspage="http://www.macromedia.com/go/getflashplayer" loop="false" scale="exactfit" />
See the width and height values in the <object> tag and the <embed> tag change those to 1600 and 1200.
Note when you republish from Catalyst, it will overwrite that file, so lock it.
Chris