Bulk image uploader to support products codes with '/'

Sometimes a product code is created with a / in it. There could for example be a product that is identical but is sold in different sizes. So you would have proda/21, proda/22 etc. However, when using the bulk image uploader there is no way to bulk upload images like this as we match the product code to the filename of the image being uploaded. You cannot save a file with this character in it.