Turn "%20" to "_" in file names.
Turn "%20" to "_" in file names.

Fixes #1499

the8472/greasemonkey,HasClass0/greasemonkey,the8472/greasemonkey,Martii/greasemonkey,Martii/greasemonkey,Ventero/greasemonkey,Ventero/greasemonkey,HasClass0/greasemonkey