Cannot open .jpg or .png files all of a sudden when using Chrome

Actually, if the file starts with "0x52 0x49", then it's a .webp image. Just replace the file name extension from 'jpg' or 'jpeg' with 'webp'. If you'd like to convert it to a 'jpg' or 'png' then open it with something like Gimp and re-save the image in the desired format.

P.S. Yes I know this question is old but it's the first in the list of answers so it should have the correct information.

Regards, Professor Techie

After short investigation it seems like the files never finished the downlod process completely and was left as chunks.

Disabling all chrome plugins seems to fix the problem, it is up to the author to find which one is causing the problem.