Do the values you placed in the htaccess file show up in vbulletin? (shows the server and php stats when you first go into your AdminCP)
Secondly I don't think theres a way to upload a folder as that folder contains multiple files. You'd have to upload a zip/rar/7z or use some other compressed file.
As for the text document, did you add .txt to allowable extensions?
(Sorry Jelle if you want me to stop with support stuff, just trying to help out where I can when I can

am in the IT business myself, its kinda second nature)