Image styles not working with & sign

I am using perusio's nginx for my new Server which has resultet in several image style not being generated.

And I found out that it was because the filenames included the & sign.

Here is the location for image styles and sorry for the newbee question, but does this has something to do with nginx and what is it @drupal does?

## Drupal 7 generated image handling, i.e., imagecache in core. See:
## http://drupal.org/node/371374.
location ~* /files/styles/ {
    ## Image hotlinking protection. If you want hotlinking
    ## protection for your images uncomment the following line.
    #include apps/drupal/hotlinking_protection.conf;

    access_log off;
    expires 30d;
    try_files $uri @drupal;
}

Thanks in advance.