This metabase property specifies the directory where compressed versions of static files are temporarily cached. If compression is enabled for IIS, every time IIS receives a request for a static file (such as an .htm or .txt file), the server searches the compression directory for an already-compressed version of the static file being requested.
To force IIS to recompress all outgoing static files, erase all files found in the compression directory specified by HcCompressionDirectory.
Important
It is strongly recommended that the
directory specified by HcCompressionDirectory reside on an
NTFS volume, not on a FAT volume. If the file being requested
resides on an NTFS volume, and you have set
HcCompressionDirectory to specify a FAT volume, IIS will not
perform any HTTP compression on that file. This behavior is due to
a number of differences between FAT and NTFS volumes, including
different time stamping and access control mechanisms. In addition,
NTFS handles directories that contain a large number of files more
efficiently than FAT volumes do.