Adding new image file types not working

[buttonsforless.com]

Hello folks,
I've read through nearly every page of the forums, but haven't found anything that helps. I did find what appears to be instructions for older versions of Prestashop, but don't work on my version, downloaded a couple days ago.

I'm trying to add (reasonably) high quality image formats to the GIF, JPG, PNG enabled customization set up, (such as .eps, .bmp, .psd and .pdf) but every move has been stifled.
When I edit the files found in the forums which apply to older versions of PS, it causes all my product pages to go blank except for the left column. This is caused by changes in the images.inc.php file as documented for older PS versions. I replace the images.inc.php with the unedited original version and my site comes back up again.

So my question is, how do enable my customers to upload .eps, .bmp, .ai, .psd etc to customize their product?

Thanks in advance! I know somebody knows!