On the R2D2 version running on one.durango, a user can create a file with a name up to 200 characters. But that user cannot move this file. The user can move this file when tested on the Sakai nightly server. Here is the file name I was using:

adlkfjkldfja;ldkfja;lkdsfjlkd;sfj;aldk111kkkkkkkkkkkkkkkkkkkkkkkkk23333333333333333333322222222222lkjjjjjjjjjjjjjjjjjjjjjjjjlkjlkjnjlkjl;kj;lkjlkjl;kj;lkj;lkj;lkj;lkjl;kjl;klkjlklkjlkjlkjlkjkajdf;lka