Hive: HKEY_LOCAL_MACHINE
Key: System\CurrentControlSet\Services\MSFTPSVC\Parameters
Name: AdminName
Type: REG_SZ
Value: AccountToBeFTPAdmin

Stop/start FTP service to make hack take effect.

FTP tips:

FTP Server background info
Set NT's FTP admin account
Set NT's FTP admin email address
Set NT's FTP default domain
How to Use Directory Annotation with FTP Server in NT Q103077
How to Log Incoming Connections with FTP Server Q103076
How to Format Directory Output with FTP Server Q103075
How to Customize the Maximum Connections Message with FTP Q103074
How to Create Greeting and Exit Messages with FTP Server Q103073