supplying running resolutions up to 800 × 600. As with ASD, the SGA upgrade also came with some additional aircraft designed by BAO, including an Ultra-light. Another addition was known as the Aircraft Adventure Factory (AAF), which had two components. The first, the Aircraft Factory, was a Windows-based program allowing custom design aircraft shapes to be used within FS4 utilizing a CAD-type interface, supported by various sub menu and listing options. Once the shape was created and colors assigned to the various pieces, it could be tied to an existing saved flight model as was designed in the Aircraft Designer module. The other component of AAF was the Adventure module. Using a simple language, a user could design and compile a script that could access such things as aircraft position, airspeed, altitude, and aircraft flight characteristics. Other add-on products (most published by Mallard Software) included: The Scenery Enhancement Edition (SEE4), which further enhanced SC1 files and allowed for AF objects to be used as static objects within SEE4; Pilots Power Tools (PPT), which greatly eased the management of the many aircraft and scenery files available; and finally, a variety of new primary scenery areas created by MicroScene, including Hawaii (MS-1), Tahiti (MS-2), Grand Canyon (MS-3), and Japan (MS-4). Scenery files produced by Sublogic could also be used with FS4, including Sublogic's final USA East and West scenery collections. Flight Simulator 5.0 − Released in late 1993 Flight Simulator 5.0 is the first version of the series to use textures. This allowed FS5 to achieve a much higher degree of realism than the previous flat-shaded simulators. This also made all add-on scenery and aircraft for the previous versions obsolete, as they would look out of place. The bundled scenery was expanded (now including parts of Europe). Improvements were made to the included aircraft models, the weather system's realism, and artificial intelligence. The coordinate system introduced in Flight Simulator 1 was revamped, and the scenery format was migrated from the old SCN/SC1 to the new and more complex BGL format. More noticeable improvements included the use of digital audio for sound effects, custom cockpits for each aircraft (previous versions had one cockpit that was slightly modified to fit various aircraft), and better graphics. It took about a year for add-on developers to get to grips with the new engine, but when they did they were not only able to release scenery, but