Missing XPL files from 3.7 nightly

I'm fairly new to Orbeon so hopefully somebody can explain what has been going on ...

I've been using version 3.7 of Orbeon quite happily all week. I've now reached the point where I need to alter the epilogue.xpl file. So I looked for the file ... nowhere to be found (and neither were the other epilogue files).

I thought I would download 3.6 and see if they were in that download - and unsurprisingly they were.

Which leads me to two questions ...

1) Can I use the files from 3.6 in the 3.7 version
2) How is 3.7 functioning without the files being present?

Thanks

Paul