I am trying to pwn my 1.1.4 iphone and when i press iPwner the following error is being given:

21/07/2008 12:51:27 - Unzipping .ipsw file to CUsers\Antoine\AppData\Roaming\cmw\winpwn\1.0.0.3\i psw
21/07/2008 12:51:27 - Unzip failed:1 is not a supported code page.
Parameter name: codepage
21/07/2008 12:51:28 - Found device product id:4752
21/07/2008 12:51:28 - iPhone connected

Can anyone please help me thanks!