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Introduction to the EditVoicepack API

The EditVoicepack Installer API makes it easy for developers of addons for Microsoft Flight Simulator X and Lockheed Martin’s Prepar3D® simulation software to include additional ATC modifications like telephony designators (a.k.a. callsigns), aircraft manufactures, aircraft types, and airport names with their addon.

  • Modify the standard Microsoft Flight Simulator X and Lockheed Martin’s Prepar3D® simulation software ATC speech engine with new or changed:
    • Telephone designators (callsigns)
    • Aircraft manufactures
    • Aircraft types
    • Airport names
  • Ensures compatibility between all addon products from different developers - even when using different versions of the Installer API.
  • Compatible with accelerated voicepacks and phraseology changes performed by EditVoicepack.
  • Runs on any system with Microsoft Flight Simulator X or Lockheed Martin’s Prepar3D® simulation software installed without any additional runtime dependencies.
    • Supports UAC in Windows Vista and later.
    • Support 32 and 64 bit systems.
License Conditions
  • The EditVoicepackInstallerApi.dll can be distributed royalty free, but can not be modified in any way.
  • The example installer application included with the API can be distributed royalty free. Derived versions of the example installer can freely be created from the included code and redistibuted royalty free.
  • One licensed version of any product that includes voicepack modifications must be given free of charge to the developer of EditVoicepack. This version will be used to test future releases of the EditVoicepack API.
  • Any voicepack modification created can be freely used in EditVoicepack, and even be included by other addon developers (freeware and/or payware). In return you are of course free to use existing modifications for your own addon (they will still need to be specifically signed for the addon you distribute them with).
  • The Installer API is provided "as is" without any warranty.

The latest version of the EditVoicepack Installer API is available from