Addon Converter X is a plugin for FSX that makes many add-on aircraft and sceneries developed for FS2004 compatible with FSX SP2 and FSX Acceleration Pack.

Many existing aircraft and sceneries suffer display problems with these FSX versions, such as missing textures or missing scenery objects in the DirectX 10 mode. Addon Converter X resolves many of these problems on the fly, thus allowing you to enjoy thousands of sceneries and aircraft developed for previous Flight Simulator versions with FSX.

Addon Converter X does not modify any files you have installed in FSX. It performs conversions on the fly as FSX is loading files. You don’t have to “convert” any add-ons you are installing. Simply copy them into FSX, and Addon Converter X will make any necessary changes automatically.
New in version 1.03

• Standalone configurator utility is now included, allowing pre-processing textures before running FSX.
• Some problems on quad-core CPUs resolved

New in version 1.02

• Ability to fix pre-FS2004 objects made with SCASM (this should resolve issues with many payware sceneries).
• Ability to fix virtual traffic aircraft that are not in Aircraft and Rotorcraft subfolders.
• Bugfix: Missing virtual cockpit textures in aircraft with more than 32767 polygons.
• Bugfix: Some aircraft parts were showing up as semitransparent.

System requirements:

• FSX SP2 or Acceleration Pack.
  Note that while the program will function correctly in FSX SP1 and RTM versions, it will not bring many advantages because these FSX version are compatible with most add-ons.
• FSX or FS2004 SDK installed. FS2004 SDK can be used with the FSX Standard Edition.
• At least 512MB of RAM recommended.

You may want to visit their homepage here

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