FileInfo.com - The File Extensions Resource

.HOG File Extension

File Type	Descent Mission File
File Format	File
Common?	No
File Description	Contains mission data for a specific level in the Descent 2 3D action game
Program(s) that open hog files	Mac / Windows: Interplay Descent; Interplay Descent 2

Information from FileInfo.com - The File Extensions Resource.
http://www.fileinfo.com/extension/hog