afio batch operation

[jeremy ardley]

I have a CD that was written by mondorescue and it has hundreds of files 
in the form

<number>.afio.bz2.
I can open individual files using Xarchiver and see they are 
individually parts of an old system of mine.

Can someone suggest a simple command line to extract the hundreds of 
files and write/merge them into a single directory tree?

--
Jeremy