PR is also known as the Princed Resource editor.
It can export and import resources (.bmp, .pal, .wav, .mid) from and to .DAT files.

Download latest (binaries and source code):
Version 1.3.1: PR-1.3.1.zip (447K)

You can use a script to make things easier: Windows batch file or Linux shell script

Documentation can be found inside the package's doc/ directory.
See also the page about changing PoP1 images.
If you want to export/import PoP2 images, use the -spop2.xml command line switch.

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Some old versions:
- 1.3.1 pre-release 2: [Windows binary and source code] 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)