Reading configuration file

Hi there.
I have to export many information to excel for some users but i have to wait for them to confirm whent to do it. They don't have database users so I was thinking to create some sort of configuration file where I do write my credentials and let them execute my script to import data...I know it's to much to ask encrypting-decrypting function to retrieve authetication info, but I'm expecting to be able of retrieving user and password.
Any advice?