Fix downloading of folders with restricted characters in them (e.g. virtual folders)
Fix downloading of folders with restricted characters in them (e.g. virtual folders)

nnamon/coursemology.org,allenwq/coursemology.org,allenwq/coursemology.org,nusedutech/coursemology.org,nusedutech/coursemology.org,Coursemology/coursemology.org,Coursemology/coursemology.org,nusedutech/coursemology.org,nnamon/coursemology.org,nnamon/coursemology.org,dariusf/coursemology.org,nnamon/coursemology.org,dariusf/coursemology.org,nusedutech/coursemology.org,dariusf/coursemology.org,allenwq/coursemology.org,nusedutech/coursemology.org,dariusf/coursemology.org,allenwq/coursemology.org,nnamon/coursemology.org,dariusf/coursemology.org,Coursemology/coursemology.org,allenwq/coursemology.org,Coursemology/coursemology.org,Coursemology/coursemology.org