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Army Men Series [PC] .AMM/.ATL Files

Posted: Sun Jan 26, 2014 12:16 am
by SRDDonkey
I cannot figure out how the AMM/ATL files for the maps in army men are loaded into the game. I assume the tiles and many of the required assets are included within these two files for a map, but cannot figure out how to extract these assets. The maps also include a "objects.dat" file which I assume is where some assets are possibly.

I have been trying my hand specifically at Army Men 2 [PC] by 3DO


Demo ... ial-Client

These two files are present throughout all their games including the original Army Men, Army Men: Air Tactics, etc

Any help is greatly appreciated :)

Re: Army Men Series [PC] .AMM/.ATL Files

Posted: Mon May 26, 2014 12:01 am
by herbert3000
Ok, this is what I figured out so far:

byte[4] maybe checksum?
byte[1024] color palette (256 colors)
uint32 number of objects

// object index table
for each object {
byte[4] unknown
uint32 offset

// actual objects
for each object {
byte[24] header
uint32 size of section1
uint32 size of section2
uint32 size of section3

uint16 sprite_width
uint16 sprite_height
for (sprite_height) {
uint16 line_offset
<run-length encoded pixel data>

55 00 -> 0x55 transparent pixels, no opaque pixels
45 01 20 0F 00 -> 0x45 tr., 1 opaque (index: 0x20), 0xF tr.

same structure as section1 (maybe semi-transparent pixels?)

looks like a monochrome bitmap (each byte represents 8 pixels)
maybe the shadow of the object?

size of section3:
(sprite_width/8) round up to the next even number
e.g. sprite_width = 85, sprite_height = 80
85 / 8 = 10.625 -> 12 (=line width)
size of section3 = 12*80 = 960

Re: Army Men Series [PC] .AMM/.ATL Files

Posted: Mon May 26, 2014 12:08 am
by herbert3000
I also managed to rebuild the map with the tileset (ATL) and the data from the TLAY section (ANM): (2.34 MB)

Re: Army Men Series [PC] .AMM/.ATL Files

Posted: Mon May 26, 2014 4:22 am
by SRDDonkey
Oh nice! I never would have been able to begin trying to comprehend that stuff xD I can't thank you enough for this help so far. Do you know about the .ani files in any way as well? :)

Re: Army Men Series [PC] .AMM/.ATL Files

Posted: Wed May 28, 2014 6:17 am
by herbert3000
Update: File format of "objects.dat" unveiled.
The *.ani files have a similar format but I haven't had time yet to go in for a closer look.

Re: Army Men Series [PC] .AMM/.ATL Files

Posted: Thu May 14, 2020 6:52 pm
by tminard
I'm building an editor for these files. Thank you for documenting the dat format... I had figured out up to the palette, and this saved me tons of time.

I'll incorporate this information here:, and I'll be sure to credit you.