The PMDG 737 For fs2004 does work in FSX.....this is how to do itCreate a folder in C: drive - Name it fs2004Install the pmdg 737 into this folder. Once installed into the folder you created there will be Sound, gauges, Modules, Aircaft etc etc........Move to the correct folders within FSX. DO NOT move the FSUIPC file...Instead make sure you have FSUIPC.4 installed into the modules folder.That it Enjoy :)