Okay, I have redownloaded TTools & AITE. Here is the Airport file:
ZYTX,N41* 38.51',E123* 29.07',197
The ZYTX is the ICAO reg, you will type EG99,. Then go into Afcad and take the coords, which you may know already as it's your own airporta and add those. The 197 is the altitude, I don't think its too exact. Save that file and leave it. DONT forget the commas!!!
Dan