In the Git-Bash you can run Notepad++ like the first command. You can set a Bash alias to it (second line) and then use that alias to launch Notepad++.

$ /c/Program\ Files\ \(x86\)/Notepad++/notepad++.exe
$ alias np="/c/Program\ Files\ \(x86\)/Notepad++/notepad++.exe"
$ np

To make this permanent, cd to switch the to home directory and there create a file called .bashrc containing the following:

alias np="/c/Program\ Files\ \(x86\)/Notepad++/notepad++.exe"
alias ll="ls -al"

(On my system this file is located in c:\Users\Gabor, so if you are not familiar with linux, it is probably easier to create the file while using Windows.)