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A bit of story. There is the Compactor tool, which is a GUI over the compact.exe tool, built into Windows 10, which allows files on NTFS storages to be compressed seamlessly and transparently - as in, the files stay where they are with same names and extensions, any software sees such files as normal, and can read/modify them as usual. Windows just decompresses them on-the-fly for any reads. The compression is pretty light (even lighter than the old DEFLATE used in ZIP archives), but decompression is so fast it has almost no performance impact. That makes it perfect for large in-use files that don't get overwritten often (because if any write is done to the file, Windows will uncompress it back and won't automatically recompress, unfortunately) and aren't already compressed with other method (because compact.exe's compression won't be efficient, and Compactor checks for this first).