File extension not in file association list

Hello, I use Notepad++ to edit Python files which have the file extension .py such as "sample.py"

I would like to set Notepad++ as the default program to open .py files.

When I open a .py file I get the popup asking me which file I want to use to open. But I do not get the choice to set the default program to open this extension.

When I go to Settings|Choose Default Apps By File Type the .py extension is not listed.

Looking through the registry I see that there is no .py handler.

Q: What is the method to manually add a file extension and associate it with a program?

Thanks!

hey I figured it out!

1) Settings - Indexing Options
2) Advanced button
3) File Types tab
4) Add New Extension to List box, type in extension (without a period) such as "py"
5) Click OK and Close
6) Settings - Chose a default app for each type of file
7) Scroll down to file extesion
8) click Choose a Default
9) select a program
10) The first time you open a file with this new association, you will get a popup asking you which program to use to open this file type. Your default program will already be selected and a checkbox with Always use the program to open this type of file will already be selected as well, just click the program type. After this you are golden.
11) Damn I spent 3 hours on this! Ugh!

I could not use the below instructions, as I am trying to change a common file type (.tif) to an application not appearing in the standard list (Microsoft's attempt to lock out competitive apps perhaps?). Just go to the file with extension that you want to open, in the File Explorer utility, right click and select "open with". Then look for your preferred app in the "other apps" list and make sure "use as default" and your are all set.

chazcon said:

hey I figured it out!

1) Settings - Indexing Options
2) Advanced button
3) File Types tab
4) Add New Extension to List box, type in extension (without a period) such as "py"
5) Click OK and Close
6) Settings - Chose a default app for each type of file
7) Scroll down to file extesion
8) click Choose a Default
9) select a program
10) The first time you open a file with this new association, you will get a popup asking you which program to use to open this file type. Your default program will already be selected and a checkbox with Always use the program to open this type of file will already be selected as well, just click the program type. After this you are golden.
11) Damn I spent 3 hours on this! Ugh!

I am very grateful that you spent all that time figuring this one out. I knew there must be a way to do it but all the other hits when I googled it just told me how to associate apps with existing extensions on the list. Thanks a zillion.

I have stuck with XP to the bitter end because of all the old docs and programs which don't work with anything later and am struggling with workarounds in Windows 10 so any leg up like this is worth its weight in gold :). Brilliant.

chazcon said:

hey I figured it out!
1) Settings - Indexing Options
2) Advanced button
3) File Types tab
4) Add New Extension to List box, type in extension (without a period) such as "py"
5) Click OK and Close
6) Settings - Chose a default app for each type of file
7) Scroll down to file extesion
8) click Choose a Default
9) select a program
10) The first time you open a file with this new association, you will get a popup asking you which program to use to open this file type. Your default program will already be selected and a checkbox with Always use the program to open this type of file will already be selected as well, just click the program type. After this you are golden.
11) Damn I spent 3 hours on this! Ugh!

LAMP90 is correct, this no longer works. THANKS MICROSHAFT!

Ok first do this:

1) Settings - Indexing Options
2) Advanced button
3) File Types tab
4) Add New Extension to List box, type in extension (without a period) such as "py"
5) Click Add, OK and Close

Then try this thanks to:

Kent Lasley posted 6 months ago
on https://notepad-plus-plus.org/community/topic/13051/set-notepad-as-default-app-in-windows-10

Gotta LOVE how windows tries to muscle out the competition!
Okay, here is a work around:

1. Create a dummy file with the extension you wish to default to your program. The file can be empty.
2. Right click on the dummy file and select Properties.
3. On the General tab there is a section that states:
   Type of file: <YOUR_SUFFIX>
   Opens with <CURRENT_DEFAULT_PROGRAM> and a button that says <CHANGE>.
4. Click Change.
5. How do you want to open <YOUR_SUFFIX> files from now on? Choose <More apps>.
6. Scroll to the bottom and select <Look for another app on this PC>
7. Go to C:\Program Files (x86)\Notepad++ and select <notepad++.exe> and select <OPEN>
8. Close Properties and your done!