WARNING >
Installing WIN10_IOTCORE 1.1.0-IDE 1.6.6.6.ZIP with card library as suggested, results in a crash of IDE 1.6.12.
Only after remore manually WIN10_IOTCORE and reinstalla Arduino IDE was able to start IDE.
Please verify and mention incompatibility on the card manager if it is a general issue and not a my mistake.
.
Giovanni