The Microsoft implementation of EAP-MSCHAPv2 overrides the abstract type BaseEapTypeParameters with type MsChapV2ConnectionPropertiesV1. This type is defined to be a string formatted according to the XML schema in section 6.7. The MsChapV2ConnectionPropertiesV1 type defines the following element:

UseWinLogonCredentials: An optional Boolean. If TRUE or absent, CHAP attempts to authenticate using the logged-on user's username and password, as specified in [MS-CHAP] section If FALSE, it does not.