Photo by Carsten Lorentzen.=
While 7Files doesn't explicitly allow you to tag files, it does give you common characteristics to use to organise and search your files. For example, the app allows you to quickly see all files you received or opened today, view only .png files created on a certain date, find all attachments you downloaded this week and so on. The utility also integrates Windows search into every Explorer window.
7Files is in alpha, so keep that in mind if you choose to give it a try. It supports both 32-bit and 64-bit versions of Windows, and requires the .NET Framework prior to install. Have you tried 7Files already, or do you prefer another alternative file browser for Windows? Share your thoughts in the comments.