Thanks to everyone-I am checking the suggestions out. Peter.

Can anyone recommend a photoviewer app for Windows 10 which is free, or a small one-off payment. Don't need editing or similar-I have the Pentax CD. Pentax's viewer images are too small at about 1/4 of the screen.Thanks for any help.
Peter.

Oh,B...........-ok!

Hi again everyone! Thanks for all the suggestions-you prompted me to return to the manual, and before I had seen Kentys post.I found there is a 'save all settings' menu item in no.5-it needed more 'o k' pushes than I had first used, but it works. I will keep Kentys way for another time.
Just to say the forum confirmed my likely choice of camera, from reading impressions of contributors-then an inheritance became available, and the Kr became a K5.Am I glad! Low light performance is phenomenal, and the anti-shake. (I like candids).What a great site-I have learned so much!
Peter.

Silly point maybe, but can I keep my K5 set on "raw" after turning it off? It seems to revert to jpeg each time. Thanks.