How to form FTP URL using absolute path for Filezilla server?

There's no magical way to simply configure FileZilla FTP server to allow an access to a whole system. For a good reason, you actually do not want to do this in general. Particularly giving even read-only access to C: (system) drive is a huge security risk.

You can configure it drive-per-drive though.

• First add a fake root/home folder and point it to some empty physical path (say C:empty) and set the folder read-only.
• Then add virtual path /X: for each X: drive you want to make accessible.