Revert "ignore mybuild.bat"

This reverts commit de35dcf06f2b825613431f3f0c2a1e8aff8d38cb.
Revert "Respect 6.1->7.1 expansion setting when creating the initial mediatype"

This reverts commit 0ff971aeb267d0b3415db73ff66a91d487e454da.
Use channel expansion settings when creating the initial mediatype