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.)