COBs are made with CAOS, and with special cob-making programs like BoBCoB. They are produced both by CL and by users of the game. For the original Creatures, there are no official cob-making programs - BoBCoB is probably the most popular unofficial one - but there are both official and unofficial tools for Creatures 2.
 This stub could use more information.
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Technical Information
Creatures 1
Creatures 1's COBs are simpler than all later COB/agent files. As with all Creatures file formats, they are in little-endian order.
They are simply defined as such:
| Length | Type | Description |
|---|---|---|
| 2 bytes | integer | COB Version (I've only ever seen 1) |
| 2 bytes | integer | Quantity Available (for injecting) |
| 4 bytes | integer | Expiration month |
| 4 bytes | integer | Expiration day |
| 4 bytes | integer | Expiration year |
| 2 bytes | integer | Number of object scripts |
| 2 bytes | integer | Number of install scripts |
| 4 bytes | integer | Quantity Used (for injecting) |
| varies | 0 or more Script blocks | Object scripts |
| varies | 0 or more Script blocks | Install scripts |
| 4 bytes | integer | Picture width |
| 4 bytes | integer | Picture height |
| 2 bytes | integer | unknown (always seems to be the same as the picture's width) |
| varies | SPR picture data | Picture. Encoded like a single frame of an SPR with no header. |
Script blocks are defined as follows
| Length | Type | Description |
|---|---|---|
| 1 byte | integer | Script Length (if 255, use second script length) |
| 2 bytes | integer | Script Length (if first script length was less than 255, this script length does not exist) |
| varies | string | Script (Lines of CAOS are comma-separated with no whitespace between them) |
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