General Support: Cruft-Free URL Modification: Changing .jpg (or extension) to .html

I was wondering if there's a way to modify the Cruft-Free URLs to give them the appearance of .html pages? It's my understanding that engines prefer text-based files over images, so perhaps this would help get our sites get indexed better?

This would mean taking a URL like:
http://www.site.com/collection/album/file-name.jpg

And having it display like:
http://www.site.com/collection/album/file-name.html

I think this could be done by doing an ereg_replace() when the file is called, but I'm not familiar enough with Plogger to quickly make this happen.

Thanks for any guidance anyone can offer.