"$(_NT_TARGET_VERSION)" evaluates to ""

[PypeBros]

freshly installed visual studio 2017 and windows driver kit 10

• pull code from github
• opening solution 'netdirect'
• projects ndutil and ndtestutil fail to load.
  If asking to reload the projects, a dialog box is shown saying that something went wrong in WindowsDriver.UserMode.Default.props: a numeric comparison was attempted on "$(_NT_TARGET_VERSION)" that evaluates to "" instead of a number, in condition "$(_NT_TARGET_VERSION) >= $(_NT_TARGET_VERSION_WIN10)"