Models, textures and sounds are all stored in pack files, held under the wurm/packs directory. These are the material that are automatically downloaded to make Wurm look nice when you start the client. The pack file format is a JAR file which is basically a ZIP file with some extra meta-data.
'''Note that modifying the graphic packs is a bannable offense'''
==Using Pack Files==
If a unique identifier is not found, the client steps back to the next broader identifier, i.e. "img.texture.house.wall.solid" becomes "img.texture.house.wall", then "img.texture.house", "img.texture" and finally "img". This stepping-back continues as long as the client has either found a resource or reached the top of this "resource chain" -- in that case it will use either a dummy texture (red X on white square) or the famous question mark bag.
==Testing Custom Packs==
To test custom packs made by you or others, just rename them so they start with "dev_" and move them into the wurm/packs directory. The client will automatically make use of the new packs when it is started the next time. This feature may not be available in future releases of the client.
[[Category:Technical Details]]