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How can I make notepad++ default program for .txt files?

1. Run Notepad++ as an Adminstrator



2. 
   

   Menu > Settings to open the "Preferences" dialog

   
   
   
   
   

   • Click "File Association"

   
   

   • Click "Notepad", then

   
   

   • Click ".txt". then

   
   

   • Click "->" to register notepad++ as the program to edit .txt files:

   
   

   • Click "Close"

   
   
   
   

With Windows 10 (Oct 2018) this worked for me:

• Open Notepad++ as an administrator and then follow the steps posted by DavidPostill above

then

• Go through the normal Windows process of right click "Open With >" > "Choose another app" and click the "Always use this app to open .txt file" box.

This took me a minute, but this should help.

1. Find a .txt file


2. Right click it


3. Select "Open with..." --> "Choose another app"


4. Scroll down and select "More Apps" on the popup


5. Select "Look for another app on this PC..."


6. Find and select notepad++.exe

If nothing of the above works, try using this:

https://www.binaryfortress.com/NotepadReplacer/

and then Right click on the file > Open With > Choose another app and select Notepad++

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:
   Opens with and a button that says .
   Click Change.


4. How do you want to open files from now on? Choose .


5. Scroll to the bottom and select
   Go to C:Program Files (x86)Notepad++ and select and select


6. Close Properties and your done!

Credits to Kent Lasley from : https://notepad-plus-plus.org/community/topic/13051/set-notepad-as-default-app-in-windows-10

After trying all the solutions described, this what I found, and how I made it work (kudos to SherylHohman for her comment in Animesh Chandra's answer for spurring me on).

For some reason I thought, 'just click on the whitespace above "always use this app to open .log files"'
and, lo and behold...

and things go back to working the way they used to.

---- edit ----
and then I find I am facing the same issue as Daniel Hári. The file reverts to opening using windows notepad (not much use, since it's an rsyncd.log file, with unix-style line endings).

so -- run regedit as administrator, and make these changes... (exporting them as .reg files results in hex output for the "ItemName". This format seems more readable). Note that the .log extension had no sub-keys on my example machine, so I did not edit that key. There are other extensions with sub-keys that may be of interest to you. I found them by searching the registry for the string txtfile .

The change seems to have become more sticky (all bets are off following the next feature update).