It seems to me that there is a general misconception regarding the SDK. Some enthusiasts think that the SDK will somehow improve the performance of FSX or even boost the performance of their computer.
SDK is not a new innovation for FSX. SDKs were available for previous versions of the sim. SDK --- Self Development Kit --- that's exactly what it is. It consists of many parts each dealing with a different aspect of creating or modifying parts or add-ons for the sim. The SDK is not a cure-all, it is a serious 'program' that has to be learned before it can be used. Attempting to use the SDK without having studied and grasped its principles is futile.
Those simmers who don't know the difference between a file and a folder, don't know anything about the most common file extensions and their use, should endeavour to get a grasp of the basic Windows functions first.
If this sounds harsh, it's not meant to... it's simply the truth.