WinDirStat is a disk usage statistics viewer and cleanup tool for Microsoft Windows (all current variants). WinDirStat reads the whole directory tree once and then presents it in three useful views: the directory list, the treemap, and the extension list.
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--- Installation Instructions (Windows)
WinDirStat: Blog
WinDirStat: Contact Support
Service Desk Contact Information
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Referenced from: Windirstat