How do I do this (raw command)?

[Llamar]

I would like to copy some info into the clipboard about a selected file on a server. The filesize in bytes actually. Is this possible and if so, what's the command?
Tried checking the help file but couldn't figure anything out.

* FlashFXP v[2].[1], build [904], [ ]registered, [x]unregistered, [ ]pirated
* OS [X] WinXP, [ ] Win2K, [ ] Win98, [ ] WinME, [ ] Other
* Running behind NAT/router [X] Yes & Model [Netgear RT314 ], [ ] No, [ ] Not sure
* Running firewall [ ] Yes, Name [ ], Ver. [ ], or [X] No
* Running Antivirus [Norton Antivirus] Yes, Name [ ] or [ ] No
* Network [X] xDSL, [ ] CABLE, [ ] Dail-Up, [ ] Other

[MxxCon]

Directory menu, "View raw directory..."

[Llamar]

Heh, that's not what I was asking.
This is what I want to do:

Select a file on a server, rightclick, Commands and then a command I've made that does the following:

Gets the filesize of the selected file in bytes and exports it to the clipboard.