Disclaimer: I know how to set default apps and file extensions, I have done it many times previously.
I have just installed Windows 10 Home on a new machine. I'm trying to associate my web development files with Netbeans specifically, but that may be irrelevant.
1. File extensions not available
Firstly, lots of common file extensions I use are not present in the file extensions list – e.g. .php extension. I don't know if that is normally available in the Windows list. I certainly didn't have to manually add the .php extension on my previous computer with the same OS.
I solved this by adding the file extension manually. As I say, I have never had to do that before.
2. "Open With" doesn't save my choice of app
If I right-click on a file and "Open with" and enable "Always use this app to open files" it will open the file in the program I select, but the file icon in Explorer will not change, and it will not set it as the default program.
I still have to select "Open with" every time I open a file with that extension.
3. I cannot choose defaults by app
Settings > Default apps > Set defaults by app
My program (Netbeans) is not in the list of available apps.
4. I cannot choose defaults by file type
Settings > Default apps > Choose default applications by file type
If I select a file extension and "[+] Choose a default", when I select an app it will hang for a second as if it's working, then nothing happens. The default will not be set, and the "[+] Choose a default" button is still there.
Note: This does work for any file type with a default app already set.
Other Info
- I can change the extension for common files such as PNG, TXT.
- I cannot change extensions for files such as HTML, CSS, JS, PHP, SQL.
Best Answer
Windows 10 patch KB4467682
I can confirm that this recent patch fixes the issue. Just update Windows 10 and it should work again