without inserting the key to install.wim. (of course I know I don't have to insert the key during the setup, but still I want to disable OOBE of asking for the key).
You can mount the WIM and set the key with DISM. Take a look at my AIO kit thread and open the script and you'll see how it's done.
+1 Thank you very much, SE! Was looking for such a file since ages and a bit shy for asking here (noob question in pro's eyes, idk) That is very much appreciated, at least by me! ;D Edit: Ohh, what about installing a provided cert? Can this also be done with this file? If so, how?