Unfortunately, this will only give you the imported keys (if any), not keys created by Electrum, because these are not stored in any file (they are dynamically derived from the seed.)
Only "electrum -oak addresses" will show them. However, as far as I know the current official Windows version doesn't support it. You may want to double-check on the Electrum thread or the #electrum IRC channel for the latest status on this.
Or if you still have access to one of my old builds (which are no longer supported but they will work fine), you can just hold down the SHIFT key while starting electrum and type the above command in the resulting console window.
PS: sacko, thanks for your kind words on the other thread