How to ADD a new file type extension to the default app list?

PickyBiker · Feb 4, 2023

Windows 11 22H2

I tried to add 3D viewer as the default app for .stl files, but .stl is not in the default app list.
I tried adding stl to the advanced indexing options list, but that didn't help.

How do you add a new file type to that default app list in windows 11?

TechnoMage2021 · Feb 4, 2023

I'm trying to understand, so bear with me.....
Why do you need to add something to that list?

When I want to open a file that is not in the default list, I just right click on it, and then click on "Open With" and tell Windows what program I want to be the default program for opening that file.
I've done that for years, and never added a file type to a list in Windows.
Good Luck,

James · Feb 4, 2023

TechnoMage2021 said:
I'm trying to understand, so bear with me.....
Why do you need to add something to that list?

When I want to open a file that is not in the default list, I just right click on it, and then click on "Open With" and tell Windows what program I want to be the default program for opening that file.
I've done that for years, and never added a file type to a list in Windows.
Good Luck,

Same here. If 3d viewer isn’t an option for when you click open with, it probably will be though, find the apps directory and choose show more programs

PickyBiker · Feb 4, 2023

In windows 11 22h2, if I right-click on an stl file and click on open with, I can select 3DViewer, but it isn't permanent. That must be done every time. I want it to be associated with 3DViewer so I can just click on the stl file and have it automatically open 3DViewer.

Selecting open with used to have an option where you could check "Always", but this does not.

PickyBiker · Feb 4, 2023

James said:
Same here. If 3d viewer isn’t an option for when you click open with, it probably will be though, find the apps directory and choose show more programs

3DViewer IS an option. The problem is .stl is not in the list of extensions where you can add a default app.

PickyBiker · Feb 4, 2023

Let me try to explain this another way.
Go to System->Choose a default app for each type of file.
Scroll down the list of extensions and stl is NOT in the list so I cannot assign it a default app.
I am trying to figure out how to add it to that list.
Hope that helps.

OAT · Feb 4, 2023

The extension can be typed and must include a dot in front of it, in this case .stl

PickyBiker · Feb 4, 2023

OAT said:
View attachment 51863

PickyBiker · Feb 4, 2023

OAT said:
View attachment 51863

The extension can be typed and must include a dot in front of it, in this case .stl

I did that, but it does not work and the screen on mine looks different. When I click the 3DViewer, it changes the screen to what I show in the second attachment. And once again, .stl is not listed.

Once again, this is Windows 11 22H2

Edwin · Feb 4, 2023

PickyBiker · Feb 4, 2023

Edwin said:
View attachment 51870

Mine doesn't look like that! Are you running windows 11 22H2?

OAT · Feb 4, 2023

"And once again, .stl is not listed."

You type in in!

PickyBiker · Feb 4, 2023

I assume you mean type .stl where it says file type or link type, and then type 3DVeiwer where it says "Search apps". I did that and it goes to the second page above where there is nowhere to type anything.

Edwin · Feb 4, 2023

PickyBiker said:
Mine doesn't look like that!

WTF!!!
Maybe you have to unblock it first!!! 🤷‍♂️

PickyBiker · Feb 4, 2023

I unblocked the file and the right-clicked and chose open with, then I selected choose another app and clicked 3DViewer. The result is in the attached image. Where is the ALWAYS button?

PickyBiker · Feb 4, 2023

If you all are running windows 11 22H2 and my dialogs have different elements from yours, does anyone have an explanation?
Here is what my system says it is running.

Edition Windows 11 Home
Version 22H2
Installed on ‎1/‎14/‎2023
OS build 22621.1105
Experience Windows Feature Experience Pack 1000.22638.1000.0

James · Feb 4, 2023

Reset and Restore Default Apps for File Types in Windows 11 Tutorial

Try this otherwise edit through registry

Edwin · Feb 4, 2023

PickyBiker said:
If you all are running windows 11 22H2 and my dialogs have different elements from yours, does anyone have an explanation?

Nope!

Maybe it's a Windows Home thing!
Are you signed on as Administrator?

James · Feb 4, 2023

Try all the following

4 Ways To Set Default Apps Properly In Windows 10

You can also set default apps by filetype or even protocol.

www.itechtics.com

PickyBiker · Feb 4, 2023

James said:
Try all the following

4 Ways To Set Default Apps Properly In Windows 10

You can also set default apps by filetype or even protocol.

www.itechtics.com

I got an error trying to run gpedit.msc and there are a couple other oddities with this system, so I am going to bite the bullet and reinstall windows from scratch.

I will let you all know the result.

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