Differences between Linux and Windows Server

I have been studying a web site that uses ASP.NET and so it resides on a Windows Server but it also uses some JScript so it is worth studying. Anyway, I am moving it to a Linux server and I have noticed some differences in the way it handles files. First of all, the Windows Server is not case sensitive. But I also noticed something else. It seems that the Windows Server can have file names with spaces in them like this: "Creative%20Design%20vert_S" where the "%20" is a space. But, when I try to upload this directory to the Linux server using FileZilla it does not seem to work. And then when I try to create the directory, I get an error "Forbidden command argument". So is using %20 in a direcory name illegal in Linux?

help being given here:- http://forums.thedailywtf.com/forums/p/25727/281073.aspx