SDK

Software Development Kits (SDKs) are available for each of the versions of FS.

You should use the appropriate SDK version to match your version of FS.

FSX

Documentation

RTM, SP1, & SP1a documentation is supplied in html format, with each folder containing the relevant html file(s).

SP2 documentation is supplied in chm format, as a single compiled html file, fsxsdk.chm.
located by default in C:\Program Files\Microsoft Games\Microsoft Flight Simulator X SDK\SDK

Toolset

SDK Toolset (FSX)

Installation

SDK Installation (FSX)

FS2004

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Toolset

SDK Toolset (FS9)

Installation

SDK Installation (FS9)

FS2002

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Toolset

SDK Toolset (FS8)

Installation

SDK Installation (FS8)