How can I view a directory as a tree in Windows 7
Use TreeSize.
If we would like to view directories and files on the left sidebar and view the text of one selected file on the right sidebar at the same time, some IDEs are good choices, for example, VS code.
WinDirStat can present a directories and files tree as same as TreeSize @Mehper C. Palavuzlar mentioned, too.
I'm wondering if there's a better software that focuses on presenting directories and files on the left sidebar like WinDirStat does and viewing various kinds of file on the right sidebar.