By default, Notepad++ will open all the files when passing folder as command line argument i.e.
notepad++.exe c:\tmp which is not what I want. You can open the folder in “workspace” mode i.e. a tree of files will appear on the left like so:
notepad++.exe -openFoldersAsWorkspace c:\tmp\
or for current folder
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notepad++.exe -openFoldersAsWorkspace .