Search for files with no extension?

My friends notebook HDD is failing and I was able to recover the pictures folder and a couple other things they wanted. Unfortunately some of the image files lack extensions. I can fix them by adding ".jpg" to the end and the file is perfectly fine. But there are years of pictures in folders categorized by Month+Year the images were taken. Is there anyway I can see a massive list of every file in the backup folder and sub folders so I can sort by type? Normally I would just do a search from the main directory but None of the file names have something in common since they used some importing program which named all the pictures as "001,002,003" etc.

Thanks
-Dan

 

IF you open Folder OPtions - View tab -
Is Hide extensions for known file types checked on ?

 

All extensions are shown. That's how I'm able to manually rename and add ".jpg". If I can get a list of all the files lacking an extension I can select them all and have a program add the extension for all of them. Which is much quicker then me renaming them all manually.

 

Did a test using Agent Ransack - Free File Searching Utility , ticking Not and using .* as the search criteria, found all content with no extension. May be of help in your case.

 

Actually, Just using ".*" with Windows search worked. I thought because there was actually no "." in the filename it wouldn't work. But it did! Thanks

 

As an anecdote, I tried the built-in search in (the excellent) Free Commander, what worked there was *. while Agent Ransack needed .* with the 'Not'.

w7 search with either *. or .* gave some seemingly random mix-up of all kinds of results with and without extensions (I'll never trust w7 search).

 

It wasn't a big deal though as I was able to view by List and sort by Type. So all the files with no extensions got grouped together. I really appreciate the advice though, it might be useful in the future!