I, personlly, among others, have addressed this topic at length on the Forum. Use your Browser's FIND / SEARCH 'feature' and enter in the work, wallpaper then press SEARCH. Read the Posts and follow-ups for each 'hit' and go from there. DON'T stop at the first few or at ones that look like they AREN'T answering your question(s). Believe me, they're on the Forum.
After you get past all the Posts and Follow-ups, and should you have more ?'s, Post up. Until then, my best to ya and hope this helps.
PS: It gets a bit 'tiring' when you repeat the same answers to same ?'s. :(