Yosemite Photos: How to select only photos Photos Version 1.0.1 (215.65.0)
I can't seem to see anywhere inside Photos to filter items by file type.  No detail/list view like in Finder for me to sort and select. Search with, for example *.JPG in the search box of Photos does not return anything. It does not seem to understand wildcards
To do so, you can create Smart Albums

These can be set to filter based on filetype.  You can set as many of these as you wish, and even modify existing ones.

In Photos go to File > New Smart Album or ⌘+⌥+N

Then you can set your filter criteria in several ways.  See the attached screenshot illustrating a PNG filter.



UPDATE: If you choose to use the Search field, enter just "jpg" without quotes to get a dropdown that shows filetype.