[SOLVED] tar making a fuss

So I've been playing with a lot of RPI images lately and some come compressed as *xz and *bz2 files.

tar -xf has been more often than not kicking up this error:

Code:tar: This does not look like a tar archive
tar: Skipping to next header
tar: Exiting with failure status due to previous errorsUsing Ark 2.19 that comes with Slackware gives no trouble. I just extract the img file as expected.

On -Current with tar 1.32