Nico Hauser on "Wordpress Attachment Category Bulk Edit"

Hi,

I'm trying to assign attachment categories to my media files. With my theme I added a custom taxonomy called 'attachment_cat'. Now I want the bulk edit multiple files to assign this category(like in posts, pages or all custom post types).

I hope someone know's a solution, because it's a pain to add a category to every single media file.

Thanks

Tyratox