Open FPK File
FPK extension files have various formats applicable to uses of a different nature, some of them are listed below.
Civilization 4
For this application, the FPK file extension is a type of game asset file used by Sid Meier's Civilization IV.
Civilization IV is a turn-based strategy computer game that belongs to the Civilization series, and would be the fourth offering of them.
The game was designed and developed by the video game development studio Firaxis Games.
In this case, the FPK file saves the art data for the game graphics.
FPK files in the Civilization IV game usually have the word Art or Assets in the name before the extension, for example Art0.fpk or Assets0.fpk.
Lastly, FPK files are also used by Sid Meier's Pirates.
JetForm FormFlow
In this use case, FPK file is a forms file created by software products developed by JetForm or Accelio.
It should be noted that this FPK extension was deprecated after the software products were acquired by Adobe Systems, which now uses the PDF format for form documents.