Littles questions & howtos

[krzys_h]

That worked on the original version, on C:GE the help for the open function tells me I have to find a "files/" folder in the installation diretory, which cannot be found. So here is my question :
Do I need to create it manually ? (and where ?) Or does writing in files isn't implemented yet ?

I believe this might have been broken in official alpha-0.1.4 version. It was fixed recently, but the development version currently has some very annoying bugs in radar() and BotFactory (and possibly elsewhere), but this should be fixed soon.
Check in <game dir>/files or C:\Users\<username>\colobot\files (on Linux - ~/.local/share/colobot/files)

I had to name my chapter "002" or it would have fuse weirdly the two chapters together.
I am doing something wrong ?

That's just how userlevels work. Imagine like all the "mods/*/levels/custom" directories are one "user/" directory from original Colobot. If you put some files with the same name into "skycenter" directory that you already have in "sample01" directory, you'll overwrite them. The "custom" directory is an exception to the chapterXXX naming scheme, so you can call the directory whatever you want (in your case I'd recommend renaming "chapter002" to "skycenter").
While this might look strange at first, this makes it possible to create mods for userlevels (at least in theory, I don't think anybody actually tried that).
I'm considering some kind of grouping for userlevels that add more than one chapter, but that'll come in the future.

And at last, does someone have the pdf with all the edition informations of user missions ? I can't find mine. I think it was in french only, but i speak french and english ^^

http://colobot.info/download/Creating_Us...els_EN.pdf
We've also started working on an updated version for Gold recently. See the document here http://krzysh.pl:3000/project/545e90d99e8bceed2284797e (copy of the source also at https://github.com/colobot/colobot-misc/tree/master/gdd), or the compiled document here - http://compiled.colobot.info/gdd/output.pdf. Look at section VIII.2