Both the scantool and dzcomm library were repacked from the upstream ZIP
files. When unpacking dzcomm, the "-a" unzip flags was used to fix text EOL
markers, since there are several shell scripts that would not run without
this change and providing a quilt patch to fix EOL markings would be crazy.
When repacking scantool, the "listports.{c,h}" files were removed since they
are non-free and not needed for the POSIX build.

The Allegro .dat files are just archives, like Tar.

The "scantool" data file contains resources for running the UI:

$ dat -l scantool.dat
Reading scantool.dat
- BMP  - ABOUT1_BMP                   - bitmap (207x57, 8 bit)
- BMP  - ABOUT2_BMP                   - bitmap (207x57, 8 bit)
- BMP  - ABOUT3_BMP                   - bitmap (207x57, 8 bit)
...

The "codes" data file contains ODB-II scan codes, which are single-line,
tab-separate text fields:

$ dat -l codes.dat
Reading codes.dat
- CDEF - pcodes                       - binary data (89594 bytes)
- CDEF - ucodes                       - binary data (15592 bytes)
$ dat -v -x codes.dat pcodes
Reading codes.dat
Exporting pcodes -> pcodes
$ head pcodes
P0001   Fuel Volume Regulator Control Circuit/Open
P0002   Fuel Volume Regulator Control Circuit Range/Performance
P0003   Fuel Volume Regulator Control Circuit Low
P0004   Fuel Volume Regulator Control Circuit High
...