Picasa my default JPG viewer, except when looking in my iPhone. Huh?

[Kzoom]

Win 7 Pro, svpk 1, on a Thinkpad.
This is weird. Finally filled up my iPhone with pictures, and went to start removing them (yes, they're all already backed up, RAID'd, water- and fire-proofed, and catalogued on a personal cloud. Whee...)

When I click any JPG on my Thinkpad, Picasa's Photo Viewer is the default. If I right-click any JPG, I get a ridiculously long context menu, including the famous 'Open with ...' option.
BUT
Neither happens when I click a JPG on the iPhone when it's attached. The default/only viewer used is Windows Photo Viewer, and the picture's orientation is usually wrong. Right-click gives the barest of menus: Preview | Open | Cut | Copy | Delete | Properties.

The iPhone's 'Internal Storage' format is listed by File Explorer as 'DCF' "Digital Camera Format", if that matters.

Copying a file from the phone to the T'pad isn't a problem, and clicking the resulting file opens it with the Picasa Viewer, my preferred default. It also opens it with the correct (different from Windows Picture Viewer) orientation.

So what's up here? No hurry, just curious. Googled for a while, didn't find anything, figured there'd be someone here with the answer.

Thanks
-k-

 

[Phillip Corcoran]

Set up your preferred photo viewer in Start >> Default programs

 

[Kzoom]

Set up your preferred photo viewer in Start >> Default programs

Like I said above, "When I click any JPG on my Thinkpad, Picasa's Photo Viewer is the default." This has been set for 3 years. That's the mystery: Windows is ignoring the default when the JPG is on the iPhone, but once the file is copied to the PC, Windows uses the default/correct app.

Gotta be something about that 'DCF' drive format, but I don't know what it is.