I know it’s an old topic, but I like non-important problems like this. I just like my desktop to look nice! So here’s the solution for other people like me, googling this problem, and finding this topic among the first results.

Get yourself a nice .ico file. I got this image (.png) https://archeinre.deviantart.com/art/Notepad-Icon-350206145
And converted it using http://icoconvert.com/ great service, no problems. For my setup (windows 10, standard settings), 24x24 looked the best in the taskbar. (You can also convert it using gimp, but it’s quite complex. Paint should also be able to do it, but you lose transparency then.)

Once you have the .ico, go to your notepad++.exe (for me it’s in C:\Users[myusername]\AppData\Roaming\Microsoft\Windows\Start Menu\Programs) but if you have it pinned to start, you can also do Right click > more > open file location

Rightclick on notepad++ > properties > Change Icon… > Browse
Then find your .ico file. Save and close. Right click notepad++.exe again > pin to taskbar (unpin first if pinning is not an option). For me, the icon changed immediately :)

Cheers!

See http://docs.notepad-plus-plus.org/index.php/Configuration_Files and there allowAppDataPlugins.xml.
Or https://notepad-plus-plus.org/community/topic/10856/install-plugins-without-administrator-privileges-gpup-exe.

Is that what you need?

I took a look at TextFX and I don’t see a “remove duplicate lines” functionality. There is an ability to keep only unique lines upon doing a sort, but this is not the same thing…not everyone wants a sort along with duplicate-line removal. So recompiling TextFX for 64-bit isn’t going to do anything for providing what the OP is asking for. Maybe I’m wrong and I just missed seeing it in TextFX?

@Juan-Miguel-Martínez said:

I can…write my own text editor with the functions I want cough

I must admit that caused me to laugh out loud–guess it was the cough part on the end. :^)

…No need to go all smartass about it.

This comment caused me to stop laughing. This forum is all about alternative solutions to problems, and Jim/Guy/Peter were simply trying to illustrate some of those. They weren’t going “all smartass” as I interpret what they said. There is usually value in all contributions here, and I for one will be checking out Strawberry Perl (used Perl before, but not the fruit-flavored variety).

That all being said, if you already know alternatives exist and are just stating that you’d like to see a duplicate lines removal feature built right into Notepad++, then point taken, request noted. As to whether or not you will ever see that happen, I have no idea.