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Apr 15, 2015 6:40 AM in response to base5700by Loner T,Resizing/repartitioning Windows is not supported by Apple. You can use third-party products like Winclone or CampTune to resize partitions.
From Boot Camp 5.1: Frequently asked questions - Apple Support
Can I resize the Windows partition after installing Windows?
No. Back up your important files, then use Boot Camp Assistant to delete the old partition and create a new one.