
You may also need additional softwares to extract and read the textures, test and debug your mod, etc. You should have installed the SDK of course, but it is also strongly recommended that you get a tool to search in all civ5 files at once, to compensate for the lack of documentation. Forgetting to import files into the VFS is the common source of problems for beginners. The main change since Kael wrote his guide is about the VFS (Virtual File System). However it was written a long time ago and some information is obsolete or missing.
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The best introduction to civ5 modding is still the Kael's Guide.

If you have no idea about modding and what are Lua and Xml, you should give a look at Civ5 Modding Explained.
