While browzing through my Windows directory, I found the Panther subdirectory, which had this icon:
Does anyone know what this signifies? I was able to open it normally, and it was, to all appearances, a normal directory.
The NTFS file system used by Windows has a built-in compression feature known as NTFS compression. NTFS compression makes files smaller on your hard drive. NTFS compression is ideal for files you rarely access and saving space on small HDD.
To get started, right-click the file, folder, or drive you want to compress/decompress and select Properties. Click the Advanced button under Attributes. Enable/Disable the Compress contents to save disk space check box and click OK twice. If you enabled compression for a folder, Windows will ask you whether you also want to encrypt sub folders and files.