After testing we found out that “Rwy12 Object Placer” works fine with FS-X. This was actually expected because Rwy12 is based on the relatively new XML format and all objects in the 40 contributed libraries are made with Gmax. Luckily, it also turned out that Microsoft did not change the GUID numbers of the default objects.

Latest news, "Ebenezer" found out that you can update a Rwy12 scenery (in FS-X) without the need to exit and reload the sim. Please see here;

http://www.sk-flightsim.com/tutorial_2/Adding%20Rwy12%20Scenery%20in%20FSX.pdf

One drawback of using Rwy12 in FS-X is the slow loading time of the new simulator. Users of Rwy12 probably remember that you have to exit and reload the simulator before you can see changes you made to the scenery you are working on – adding, editing and deleting objects.

A way to overcome the slow loading time of FS-X is to built your scenery in FS-9 and then copy the BGL file to FS-X. This can be done only on similar locations, such as an airport.

In order to work with Rwy12 Object Placer program on FS-X, you have to install FSUIPC4 in the modules folder of the simulator (the new FSUIPC has an automatic installer that will do it for you). The new version – 4.02 – is available at http://www.schiratti.com/dowson.html The free version will do the job, but we recommend to buy the full registered version (euro 24.0), which will give you a lot of additional benefits, from calibrating the yoke and engines to using assignment that otherwise does not exists.

If Rwy12 was already installed for FS-9 on your PC you don’t have to do anything, except adding FSUIPC4 v4.02 files to the FS-X modules folder and copy the  “Static Objects Library” with it’s scenery and texture sub-folders to the add-ons folder of FS-X. A warning!!! – make sure you don’t have multi-copies of Static Objects Library BGL files on your PC.