PR is also known as the Princed Resource Editor.
It can extract DAT files into directories, and vice versa.
Documentation can be found inside the packages' doc/ directories.
See also the page about changing PoP1 images.
Download latest (Windows binary and source code):
Version 1.3.1 pre-release 2: PR-1.3.1-prerelease2.zip (360K)
- 1.3: [Windows binary and source code] PR-1.3.zip (429K)
- 1.2: [Windows binary] pr1.2.win.bin.zip (106K) [source code] pr1.2.src.tar.bz2 (152K)
- 1.1: [Windows binary] pr1.1.win.bin.zip (57K) [source code] pr1.1.src.tar.bz2 (134K)
If you want to export/import PoP2 images, use the -spop2.xml command line switch with version 1.3 or newer.