First things first, there's an Armory section on the forums, and last time I've read, Armory's website wasn't in control of the current developer.

1. Yes, I think current versions should be able to open your wallet file.
2. Yes, default home directory for Armory should have your file
3. If left on default, a wallet.dat file was created, however it doesn't have anything to do with your Armory install
4. I assume not