Does Mount and Blade: Warband from Greenman Gaming activate on Steam?

Just wondering, as I have store credit so I can obtain it free of charge. Also deciding between this and Tomb Raider: Underworld.

It probably does judging by the Steam CD-key list.

• Mount & Blade CD Keys in this format: 1AB2C-D3FGH-456I7-JK8LM-NOP9Q
• Mount & Blade: Warband CD Keys in this format: 1AB2C-D3FGH-456I7-JK8LM-NOP9Q
• Mount & Blade: With Fire and Sword CD Keys in this format: 1AB2C-D3FGH-456I7

Steam

Talk to Greenman support to be sure though.