Windows 10: How to change default app? Standard instructions are not working

Help!I'm trying to change the default app for a particular file extension. I've worked through the standard instructions and I can select the app I want to change to, but then Windows completely ignores that I've selected it.I'm not getting any error messages. I can navigate to the app I want to use, it shows as an application, and I can select it from the file explorer window, but once I click 'Open' on the file explorer it just disappears and isn't given as an option. Same problem if I try and open the file with this app 'Just this once'.The app is an updated version of an existing app. No

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How to change default app for file type

'Open With > Choose another app' has three step, in the first it only offers apps registered for that file type. If you click 'More apps' it lists all registered apps regardless of suitability. Both these steps have the tick-box for 'Always use...' in my 18363.752. The third step, if needed, is 'Look for another app on this PC'. The 'Always use...' must be ticked before taking this step if you want the change to stick. However, WMP appears at the second step.

For a quick look at a JPG almost anything (including WMP) is more practical than Photos which on my system takes more than ten seconds just to open a photo. The OP is probably not aware that the Windows Photo Viewer is still available in W10, but hidden away. That's my default viewer for JPG.


Restore Windows Photo Viewer in Windows 10

And, once enabled, is available in Settings > Apps > Default apps.

 

Instructions to change board?

Boot off of the windows CD, repair your XP partition (hopefully you won't have to reinstall windows), install drivers, and you're good to go. You'll see dual channel mode in the BIOS splash screen results from POST. It'll be pretty obvious *Stick Out Tongue . Here's a list of general tweaks for the 939Dual-SATA2.
Step one- Set time, date
Step two- In CPU settings, disable cool n quiet, set memory clock to DDR400, play with memory timings (CAS-TRAS-TRP-TRCD), which are listed in the bios in the order CAS, TRCD, TRAS, and TRP. EDIT- new BIOS's mess around with this order, can't be too sure on it, but yeah at least you know what the RAM timings stand for *Big Grin .
Leave MA timing at 2T unless you think your system can handle 1T
Step three- in Chipset settings, enable onboard LAN, disable onboard Audio, disable AGP fast write, set primary graphics adapter, and set CPU-NB and NB-SB link speed to 1000mhz.
Step four- in IDE, disable controllers you aren't using. On all drives detected, enable SMART if you can and set PIO/DMA as high as they will go.
Step five- Enable legacy USB support
Step six- Set password if you're worried about anyone screwing around with your BIOS settings
Step seven- Configure your boot sequence. I reccomend hard drive first, optical drive second, and floppy drive third.
Step eight- Save changes, boot into XP, and enjoy your computer.

 

Cannot change the default apps by using control panel

Original Title: Cannot change default apps.

As said, I cannot change the default apps by using control panel > ... > Default Apps tab.

I cannot change any of the default programs. I use paint.net to edit/view photos and I cannot set it to the default program even though it is on the list, it does not change and i'm stuck with the default photo viewer. This happens with any other app actually,
I cannot change the default music player there, nor browser or anything.

I followed these steps as suggest by a microsoft engineer, post 2, and later on, no avail.

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I refuse to use work arounds, I'd like a proper solution is possible, thank you.