For the .zip, look in the LocalSetting.php file. I think there is all extension allowed there.
I agree. The Documentation is very poor. I mean, I was completely new to Wiki, and it took me one hour to understand how to make a new page! I have found many option my making mistake (like using list or sub title)
But I try to work with it and I try to make flash animation for helping visitor to understand wiki. It's not that hard, just very badly documented.
My only problem is with the menu on the left. There is the Wiki Image just over that I removed. (I have made my own Header) IE is smart enough to see the image isn't there and push on top the menu. Making the perfect alignment.
Firefox is stupid, and don't see the image was removed. So, the space for the image is still there and the menu is too low. I can correct that telling it where I want it, but if I fix Firefox, IE6 is wrong (Firefox start to count right after the header while IE6 start to count from top of the page.)
So if I give x=0 and y=150 for the menu, the 150 is different from IE and Firefox.
In IE it will be 150 while on Firefox it will be 150 + the header image (130px) so it makes it 130 pixel lower.