Manifest script for FTP Redirection

1. My client has a Window application and wants to distribute it's software updates to application users 2. Every user has it's own user name and password 3. My client has a Linux FTP Server (with only one FTP User Account) 4. My client want to distribute his application updates to users using the FTP Server account 5. Everytime a user for the application connects to FTP Server (using the hardcoded FTP user name and password-the user does not know these credentials) the FTP Server must redirect the user name to the suitable FTP Folder for download the suitable application file, based on the application's UserName and Password. I want this manifest file for doing all these things