.att is the extension used for the Creatures series ATT files, also known as body data files. These files can be viewed and edited in a plain text editor, such as Windows Notepad. They are used by the Creatures games to detail how to connect (or "attach") breed images together. Each breed image file has an associated attachment file by the same name, in which the co-ordinates of key points for each pose are written.
You can find the file naming convention here.
File Structure
Each ATT file contains one row for each image (or 'pose') within its corresponding sprite file. Each pair of columns represents the coordinates (x and y) of a specific connecting body part on the image the row relates to.
Creatures 1:
- 12 ATT files A-L
- 10 rows x 4 columns
- exception: body has 12 columns (last 2 are zeros)
Creatures 2:
- 14 ATT files A-N
- 10 rows x 4 columns
- exception: body has 12 columns
Creatures 3/DS:
- 14 ATT files A-N
- 16 rows x 4 columns
- exception: head has 10 columns (last 6 are zeros)
- exception: body has 12 columns
Creatures Village:
- 17 ATT files A-Q
- 16 rows x 4 columns
- exception: head has 10 columns
- exception: body has 12 columns
- exception: hair has 2 columns
Note that numbers within .att files do not have leading zeros, the files have one single space character between each number, and each row finishes with one space and then a return character.
 This stub could use more information.
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