MFCFG.EXE missing in PS4.5 and x64 Citrix
The MFCFG.EXE utility is not included on Xen App 4.5 or newer versions of Citrix. This also includes PS4.0 64 Bit.
In order to manage session connection setting either use Group Policy or if you want to manage the settings locally on the server use TSCC.MSC