[Haskell-cafe] wrong GHC source files

https://www.haskell.org/ghc/download_ghc_7_10_3#sources reads Source Distribution ----------------------------------------------------------------------------- The source tarballs provide everything necessary to build the compiler, interactive system, and a minimal set of libraries. For more information on building, see the building guide. ghc-7.10.3b-windows-extra-src.tar.bz2 (92 MB) ghc-7.10.3b-windows-extra-src.tar.xz (91 MB) Shouldn't the two files be as follows? ghc-7.10.3b-src.tar.bz2 ghc-7.10.3b-src.tar.xz