I've been away from flight simming for a while, and have just returned to find that ESP has been resurrected as Prepar3d.The last time I was looking at updating some of my old FS2004-era planes to FSX I was stumped by some hurdles including how to get Max assets converetd to MDLs, and how to tweak AIR files.I got as far as finding out about ESP right that the moment MS dropped it; I resigned myself to waiting for MS Flight to appear.I've just found the Prepar3d SDK, and also read, with relish, that the modelling tools now support Max2012!Can the Prepar3d SDK create FSX-compatible MDL files?Does the Prepar3d SDK allow the in-depth customization of AIR files that ESP seemed to allow? (using something like ASM2AIR?)If the answer to both of these is yes, I'll be a very happy lad!

Prepar3 to be happy (sorry, couldn't resist :-> ).Yep, the 3DS Max Tools in the Prepar3d SDK do currently output FSX-SP2/XPack SDK compatible MDL files (well, .X and .XANIM files). And yes, the Asm2Air tool, headers, and docs are included in the Prepar3d SDK. The in-sim tools (Object Placement Tool, Traffic Toolbox, VisualFX Editor, etc) will not work with any version of FSX (those files only work when the SDK version matches the sim version).Tim