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PKE extension is recommended for Eternity-specific modifications. Eternity uses a model mostly compatible with ZDoom's, detailed here.

Doomsday and Risen3D use a model detailed here.Since the ZIP format imitates a file system with a tree hierarchy, the differences between the various implementations of "PK3" files reside mostly in the folder structure to which a PK3 mod should conform. But unlike WAD files (which have standardized marker lumps such as P_START/P_END or F_START/F_END for various lump types), there are no cross-port standards for how data should be organized when placed in a PK3 file. Several source ports have adopted support for using PK3 instead of, or in addition to, WAD files to distribute mods. However, contrarily to the PAK format used by Quake and Quake II, PK3 is not its own format, but merely a naming trick to prevent the operating system from associating these files with "virtual folders" or archiving software, and to avoid leading users to believe they have to extract the content to make the game work. This nomenclature was introduced by Quake III Arena. PK3 is an alternate extension for ZIP files.