There is probably a more efficient way to do it, but a "text" filter on "filename" "ends with" ".jpg" should get you something to start with.
GENIUS! Thank you so much!
I only recently started using Lightroom and still learning the little details like that.
Apply a metadata search filter, is another method-
1. Select the folder of images to view. That could be "All Photographs" in the Navigator panel. One single Folder, or several folders- (Hold [Ctrl/Cmd] as you select multiple folders- as in image)
2. Click on [Metadata] at the top of the grid view
3. Put mouse cursor on one column header, click the arrows for the drop-down menu, choose [File Type]
4. In this column select 'JPG' ( and "all photographs" in any other Metadata Columns.)
5. You can "Lock" the filter to see only jpg files when you change folders by clicking to close the padlock. Normally the filter de-activates if you select another folder.
6. You can also Save a 'preset' of this search choices to use at any time in the future, by clicking the arrows next to [No Filter] and the padlock.
This is great too. It is a little better because it ensures both jpegs and jpgs are included.
I knew a file-type filter was available, but I could not find it.
wobertc, good catch!