Renaming a file on windows with @20 in name

[Stephen P Rufle]

I am trying the following.
svn ren "4...@20hrs.jpg" "48 hrs.jpg"
I get the following message
svn: '48' is not under version control

I would like to automate the task of renaming ~100 files. I was able to 
use TortoiseSVN to do a single file manually, but am not sure how to get 
this to work from the command line.

Please help :)