At a customer site testing provisioning, we ran into a problem with the quote " symbol inside passwords.
The following items choke with this:
Generating the ssl certificates.
SQL Connections from the PXE server (but not from the App Server).
Setting the Windows administrator password in unattend.txt
The first two, have been logged as bugs. The last one is Microsoft's problem.
So, in general, beware of " symbols in password files. There is nothing really wrong with them, but it looks like it can cause problems!!
Incidentally, it happened because we had a UK keyboard, and the locale got set back to US. When we typed an @ symbol, we didn't know that we had really typed a " symbol!!