We will talk about file types (how to open which file with which program) as well as when to use which tool...
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.
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.
All the basic editors [1] open them (without polluting them).
More at https://en.wikipedia.org/wiki/XML
Ideal for working together on a text.
A "pad" is an online collaborative text editor (there are also spreadsheet-type files). Each user's contributions are colour-coded, appear on the screen in real time and are recorded as they are typed.
Comparison with a wiki page: if 2 wiki contributors work on the same wiki page at the same time, the last one who saves the page overwrites the content of the other one [2]. To correct a mistake, it is therefore better to edit a section (via the edit to the right of the title) rather than edit the whole page (via the top toolbar).
To use a pad:
More at https://framapad.org/en/ (free and free pads) and https://en.wikipedia.org/wiki/Portable_Application_Description.
Free provider at https://degooglisons-internet.org/en/list/ with e.g:
Bureaucrats who have access to NC Ryzom (the cloud dedicated to the Wiki project) must connect to it not with their personal name but with their account name.
To create a pad, click on the + icon at the top center of the screen.
OpenDocument is an open data format for office applications: word processing, spreadsheets, presentations, diagrams, drawings and office databases. OpenDocument is the usage designation of a standard published by OASIS and whose official name is Open Document Format for Office Applications, also abbreviated as ODF.
In France, the OpenDocument format is the only format recommended as an office automation format by the Référentiel général d'interopérabilité since its version 2.0 validated on April 20, 2016.
More on https://en.wikipedia.org/wiki/Markdown
For those who have access to NC: choose Text File, and name it .md.
On the cloud, with .km
To understand the idea: https://en.wikipedia.org/wiki/Mind_map and https://framapad.org/en/
On this wiki, Tips for wiki contributors presents various tips for working on wikis (firefox tips for managing tabs, RSS for tracking changes, using Ryzom Cloud...).