There isn't a single WiFi-password, I think. There is one for each WiFi-router you ever accessed and didn't delete. So I wonder what you mean with "the saved WiFi-password".
One of the basic ideas of encryption is that the key is secret. So only Microsoft can answer your question. Nobody else can.
By the way, hex isn't an code. It's a way to write integer numbers, just like decimal or binary are. Decimal 10 = binary 1010 = hex A = octal 12.
AES and WPA are ways (protocols) to encode a WiFi-signal. I don't think Windows uses it internally.
I found the .xml file that contains the saved WiFi password on a Windows 10 surface pro. The file is not encrypted but the password is.... Is there a way to decrypt this text to get the password?
I can't figure out a way to decrypt it. I think I may be hex, AES, wpa2psk If those mean anything. Thank you so much for the help