Question about the repair guide download in the help

Hello.

I'm totally excited about the manual. Let's see if I can make PDFs with content forgiveness over the winter...
There are however three pages in a funny format, ending '.psd' to which program belongs this extension respectively. how do I get them opened.
It is about three pages 00tm6.psd 'Fahrwerk', 01-07,8.psd 'E-anlage' and 27.00.psd 'Stromlaufplanen'. There's probably nothing important on the pages, but I'd like to know!
Maybe someone can help me out there.

Greetings
Karsten