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A tileset is stored in a file with the extension .SET (note: requires DOS / Windows style line endings, not UNIX ones), however, a tileset is nothing more than a standard Windows INI file. Any standard INI read/write program should be able to view or edit a SET file. Such files are human-readable, and have a format much like JavaScript object notation (JSON) or XML. Being an INI file, the SET layout only has "sections", "keys" or "properties", and "values" for each of those properties. In short, it's a very simple tree structure.


You can specify a value of -1 in a tile reference to allow the group to use randomized parts. However, you CANNOT set the bottom-left (first) tile in a group to -1. (Merricksdad: this crashes the toolset for me)

Important note for UNIX users: If you're using a text editor to edit your SET file by hand, make sure you save with DOS file endings (\r\n), rather than UNIX line endings (\n). Using UNIX line endings in the SET file crashes the toolset when you try to create an area.

Toolset Blueprints (ITP)

A set file needs to have an associated ITP file which contains the construction materials, with proper names, for use in the toolset. Good SET editors have built in features to build these for you.