+ ;; xz'ed archives
+ (list "\\.t\\(ar\\.\\)?xz$"
+ "unxz -c * | tar xvf -"
+ ;; Extract files into a separate subdirectory
+ '(concat "mkdir " (file-name-sans-extension file)
+ "; unxz -c * | tar -C "
+ (file-name-sans-extension file) " -xvf -")
+ ;; Optional decompression.
+ "unxz")
+