Windows Explorer provides the ability to flag files and folders for transparent compression via the File->Properties->Advanced dialog box:
|Windows Explorer Advanced Attributes Dialog|
Files flagged for compression are transparently compressed and uncompressed by the underlying filesystem when accessed or modified, which normally means that storage capacity is saved at the expense of extra CPU overhead during file I/O.
New files and folders inherit the compression flag from the parent folder, unless created with the FILE_NO_COMPRESSION option.
Once flagged, Windows explorer presents compressed files and folders differently to those that aren't compressed:
|Windows Explorer Directory Listing|
... [share] vfs objects = btrfs path = /mnt/btrfs_fs
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