File formats
From EncyclopAtys
We will talk about file types (how to open which file with which program) as well as when to use which tool...
Ryzom Files
See Ryzom location (for now in French only fr:Manuel de l'utilisateur/Ch 1 - Dossiers et fichiers de Ryzom) lists all important folder and file locations, for all operating systems (Windows, GNU/Linus and Mac and with or without Steam).
A good number of files in the game are in xml format. It's better to save them (copy and paste under another name) before modifying them because some of them, in case of error, will prevent the game from loading.
Common Formats
Ryzom is a sandbox, part of whose code is said to be Open Source, see Ryzom on fsf.org.
We prefer "free" formats and tools (see Open Format and Proprietary Format) as soon as possible.