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


PickyBiker

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Windows 11
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?
 

My Computer

System One

  • OS
    Windows 11
    Computer type
    PC/Desktop
    Manufacturer/Model
    Dell Alien
    CPU
    12th Gen Intel(R) Core(TM) i9-12900F 2.40 GHz
    Memory
    32GB
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,
:cool:
 

My Computer

System One

  • OS
    Win-11/Pro/64, Optimum 11 V5, 23H2 22631.3374
    Computer type
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    Home Made w/Gigabyte mobo/DX-10
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    AMD FX 6350 Six Core
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    Given to me as DEAD, and irreparable.
    Rebuilt with Gigabyte mobo, AMD cpu, 16GB ram and 500GB Crucial SSD.
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,
:cool:
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
 

My Computers

System One System Two

  • OS
    Windows 11 21H2
    Computer type
    PC/Desktop
    Manufacturer/Model
    Chillblast
    CPU
    AMD Ryzen 3 3100
    Motherboard
    Asus ROG Strix b450-f
    Memory
    Corsair 8GB x 2 (16GB)
    Graphics Card(s)
    Asus Nvidia Geforce GTX 1650 Super
    Monitor(s) Displays
    Dell 27" 1440p
    Screen Resolution
    1440p
    Hard Drives
    Seagate Barracuda 1TB
    256GB NVME Seagate Barracuda
    Browser
    Firefox / Edge
    Antivirus
    Windows Defender
  • Operating System
    Windows 8.1
    Computer type
    Laptop
    Manufacturer/Model
    HP
    CPU
    Amd E2
    Memory
    4GB
    Hard Drives
    128GB SSD
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.
 

My Computer

System One

  • OS
    Windows 11
    Computer type
    PC/Desktop
    Manufacturer/Model
    Dell Alien
    CPU
    12th Gen Intel(R) Core(TM) i9-12900F 2.40 GHz
    Memory
    32GB
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.
 

My Computer

System One

  • OS
    Windows 11
    Computer type
    PC/Desktop
    Manufacturer/Model
    Dell Alien
    CPU
    12th Gen Intel(R) Core(TM) i9-12900F 2.40 GHz
    Memory
    32GB
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.
 

My Computer

System One

  • OS
    Windows 11
    Computer type
    PC/Desktop
    Manufacturer/Model
    Dell Alien
    CPU
    12th Gen Intel(R) Core(TM) i9-12900F 2.40 GHz
    Memory
    32GB
Screenshot 2023-02-04 210001.jpg

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

My Computers

System One System Two

  • OS
    Win11 All /Debian/Arch
    Computer type
    Laptop
    Manufacturer/Model
    ASUSTeK COMPUTER INC. TUF Gaming FX705GM
    CPU
    2.20 gigahertz Intel i7-8750H Hyper-threaded 12 cores
    Motherboard
    ASUSTeK COMPUTER INC. FX705GM 1.0
    Memory
    24428 Megabytes
    Graphics Card(s)
    Intel(R) UHD Graphics 630 / NVIDIA GeForce GTX 1060
    Sound Card
    Intel(R) Display Audio / Realtek(R) Audio
    Monitor(s) Displays
    Integrated Monitor (17.3"vis)
    Screen Resolution
    FHD 1920X1080 16:9
    Hard Drives
    2 SSD SATA/NVM Express 1.3
    WDS500G2B0A-00SM50 500.1 GB
    WDCSDAPNUW-1002 256 GB
    PSU
    19V DC 6.32 A 120 W
    Cooling
    Dual Fans
    Mouse
    MS Bluetooth
    Internet Speed
    Fiber 1GB Cox -us & ADSL Bouygues -fr
    Browser
    Edge Canary- Firefox Nightly
    Antivirus
    Windows Defender
    Other Info
    VMs of Windows 11 stable/Beta/Dev/Canary
    VM of XeroLinux- Arch based & Debian 12
  • Operating System
    Windows 11 Insider Canary
    Computer type
    Laptop
    Manufacturer/Model
    ASUS X751BP
    CPU
    AMD Dual Core A6-9220
    Motherboard
    ASUS
    Memory
    8 GB
    Graphics card(s)
    AMD Radeon R5 M420
    Sound Card
    Realtek
    Monitor(s) Displays
    17.3
    Screen Resolution
    1600X900 16:9
    Hard Drives
    1TB 5400RPM
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
 

Attachments

  • app.jpg
    app.jpg
    43.8 KB · Views: 1
  • app2.jpg
    app2.jpg
    31.9 KB · Views: 1

My Computer

System One

  • OS
    Windows 11
    Computer type
    PC/Desktop
    Manufacturer/Model
    Dell Alien
    CPU
    12th Gen Intel(R) Core(TM) i9-12900F 2.40 GHz
    Memory
    32GB
0002529.png
 

My Computers

System One System Two

  • OS
    Windows 11
    Computer type
    PC/Desktop
    Manufacturer/Model
    ASUS ROG Strix
  • Operating System
    Windows 11
    Computer type
    Laptop
    Manufacturer/Model
    ASUS VivoBook
"And once again, .stl is not listed."

You type in in!
 

My Computers

System One System Two

  • OS
    Win11 All /Debian/Arch
    Computer type
    Laptop
    Manufacturer/Model
    ASUSTeK COMPUTER INC. TUF Gaming FX705GM
    CPU
    2.20 gigahertz Intel i7-8750H Hyper-threaded 12 cores
    Motherboard
    ASUSTeK COMPUTER INC. FX705GM 1.0
    Memory
    24428 Megabytes
    Graphics Card(s)
    Intel(R) UHD Graphics 630 / NVIDIA GeForce GTX 1060
    Sound Card
    Intel(R) Display Audio / Realtek(R) Audio
    Monitor(s) Displays
    Integrated Monitor (17.3"vis)
    Screen Resolution
    FHD 1920X1080 16:9
    Hard Drives
    2 SSD SATA/NVM Express 1.3
    WDS500G2B0A-00SM50 500.1 GB
    WDCSDAPNUW-1002 256 GB
    PSU
    19V DC 6.32 A 120 W
    Cooling
    Dual Fans
    Mouse
    MS Bluetooth
    Internet Speed
    Fiber 1GB Cox -us & ADSL Bouygues -fr
    Browser
    Edge Canary- Firefox Nightly
    Antivirus
    Windows Defender
    Other Info
    VMs of Windows 11 stable/Beta/Dev/Canary
    VM of XeroLinux- Arch based & Debian 12
  • Operating System
    Windows 11 Insider Canary
    Computer type
    Laptop
    Manufacturer/Model
    ASUS X751BP
    CPU
    AMD Dual Core A6-9220
    Motherboard
    ASUS
    Memory
    8 GB
    Graphics card(s)
    AMD Radeon R5 M420
    Sound Card
    Realtek
    Monitor(s) Displays
    17.3
    Screen Resolution
    1600X900 16:9
    Hard Drives
    1TB 5400RPM
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.
 

My Computer

System One

  • OS
    Windows 11
    Computer type
    PC/Desktop
    Manufacturer/Model
    Dell Alien
    CPU
    12th Gen Intel(R) Core(TM) i9-12900F 2.40 GHz
    Memory
    32GB
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?app4.jpg
 

My Computer

System One

  • OS
    Windows 11
    Computer type
    PC/Desktop
    Manufacturer/Model
    Dell Alien
    CPU
    12th Gen Intel(R) Core(TM) i9-12900F 2.40 GHz
    Memory
    32GB
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
 

My Computer

System One

  • OS
    Windows 11
    Computer type
    PC/Desktop
    Manufacturer/Model
    Dell Alien
    CPU
    12th Gen Intel(R) Core(TM) i9-12900F 2.40 GHz
    Memory
    32GB

My Computers

System One System Two

  • OS
    Windows 11 21H2
    Computer type
    PC/Desktop
    Manufacturer/Model
    Chillblast
    CPU
    AMD Ryzen 3 3100
    Motherboard
    Asus ROG Strix b450-f
    Memory
    Corsair 8GB x 2 (16GB)
    Graphics Card(s)
    Asus Nvidia Geforce GTX 1650 Super
    Monitor(s) Displays
    Dell 27" 1440p
    Screen Resolution
    1440p
    Hard Drives
    Seagate Barracuda 1TB
    256GB NVME Seagate Barracuda
    Browser
    Firefox / Edge
    Antivirus
    Windows Defender
  • Operating System
    Windows 8.1
    Computer type
    Laptop
    Manufacturer/Model
    HP
    CPU
    Amd E2
    Memory
    4GB
    Hard Drives
    128GB SSD
If you all are running windows 11 22H2 and my dialogs have different elements from yours, does anyone have an explanation?
Nope!

0002530.png

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

My Computers

System One System Two

  • OS
    Windows 11
    Computer type
    PC/Desktop
    Manufacturer/Model
    ASUS ROG Strix
  • Operating System
    Windows 11
    Computer type
    Laptop
    Manufacturer/Model
    ASUS VivoBook

My Computers

System One System Two

  • OS
    Windows 11 21H2
    Computer type
    PC/Desktop
    Manufacturer/Model
    Chillblast
    CPU
    AMD Ryzen 3 3100
    Motherboard
    Asus ROG Strix b450-f
    Memory
    Corsair 8GB x 2 (16GB)
    Graphics Card(s)
    Asus Nvidia Geforce GTX 1650 Super
    Monitor(s) Displays
    Dell 27" 1440p
    Screen Resolution
    1440p
    Hard Drives
    Seagate Barracuda 1TB
    256GB NVME Seagate Barracuda
    Browser
    Firefox / Edge
    Antivirus
    Windows Defender
  • Operating System
    Windows 8.1
    Computer type
    Laptop
    Manufacturer/Model
    HP
    CPU
    Amd E2
    Memory
    4GB
    Hard Drives
    128GB SSD

My Computer

System One

  • OS
    Windows 11
    Computer type
    PC/Desktop
    Manufacturer/Model
    Dell Alien
    CPU
    12th Gen Intel(R) Core(TM) i9-12900F 2.40 GHz
    Memory
    32GB
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