dear friend
i dont know
learning.escapestudios.com (and i dont want to know it, to be honest and cruel) but there is a simple method of joining file parts or files: use a tool such as
winhex to concatenate
any kind of file or
any file(s)!
if you know the order of the files (here: file parts), then join the parts in this correct order with winhex.
good luck *ggg*