In a message dated 18/10/2006 02:57:08 GMT Daylight Time, bones@xxxxxxx writes: Having not seen this tool I can only guess as to what it is trying to do. With FS2004 you write the XML code in Notepad and then bang this file, plus the bitmaps, into a CAB file using VCAB.exe. By the sound of it ACE.exe appears to be doing all this in one operation. All I can tell you is that your old FS2004 XML files and bitmaps still work in FSX. In FS2004 you could keep all these files "loose" i.e. not wrap them up in a CAB, and they would still work. I've not tested this in FSX so I can't say whether the CAB route is now mandatory or not. bones Bones, You are correct, the old 2004 XML files work in FSX. My objective was to bring the source code into the new format, as I think that once I get familiar with it the ACE tool will make the gauges easier to maintain and modify. The ACE tool just produces the XML code. By dragging the folder containing your source files onto the CABDIR icon in the SDK a CAB file appears by magic. I have experimented with the "loose" files approach, and it appears to work with the demo sample file supplied. If I could get my gauge to work I'd be more confident about that answer! What the whole process lacks at the moment is an XML file parser which is clever enough to tell me why my gauge doesn't appear! I think I must have left at least one essential property in the wrong state, its tracking this down that's a problem. If some genius can come up with this the whole process would be much simplified. Frank T.