First of all, nice program! But here's an issue with the user interface.

If you press Right on the keyboard to expand a directory, then press Down, the cursor is moved to the top of the list, rather than the first item of the directory you just expanded.

Nice work! Are you considering moving the project to .NET Core 3.0 WPF?

Currently "WinDirStat.Net" isn't the best naming choice. Typing the name in lowercase is equivalent to typing the URL of the real WinDirStat Homepage. This will end up sending the user there when trying to search from the URL bar of a browser. This name may also take away valid traffic from the real windirstat.net.

The new name should stick to these guidelines:

• Be recognizable as a WinDirStat clone
• Highlight the purpose/features/uniqueness of this clone
• Be easily pronounced

Various name ideas

• WinDirStatPF (simple w/ base name intact)
• WinDirStatNet (easy way out)
• WinDirSharp

Ideas based on altWinDirStat's name

• netWinDirStat
• dotWinDirStat