Somehow Windows 10 preview installer doesn't recognize bootcamp partition/disk which is in GPT.

This problem became tricky now.
I already searched this support communities and found many similar questions.
But most of them were that the disk is in GPT but Windows expected MBR.
There is another case where Windows installer expects GPT but the disk is in MBR.
My case is different.
The Disk Utility says the disk is in GPT. (GUID Partition Table.)
And I used Bootcamp Assistant to partition the disk.
However, the Windows 10 Technical Preview installer thinks that it's in MBR. (yes. It's for 64bit.)
So, it looks to me that Windows installer somehow obtain the disk partition information wrongly.
Are there any people who were successful in installing Windows 10 Technical Preview?
<Fig.1> Disk Utility shows that it has GPT.
<Fig.2> windows installer thinks that it's in MBR, although it's actually in GPT.
Is there any

Yes. It looks to be so. I've also read somewhere at MSDN site : GPT can contain MBR.
However, still it looks to me that its either/both Apple and MS implementation issue.Disk Utility says it's in GPT, but Windows installer doesn't think so.
I also tried DISKPART on windows to see if what partition type it thought, but it didn't give me such information.
What is even more interesting was VirtualBox. I decided to install on VirtualBox, and if "Enable EFI" option is on, the x64 version of Win 10 TP version couldn't be installed. I had to turn it off. So, according to MS, Win 10 for x64 is GPT-only. (I read so.. maybe I'm wrong.) but the "Enable EFI" mode should be turned off. Anyway, I decided to install on VM although it's slow for now.
Thank you for sharing your thoughts.

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