I've been searching around on the internet for a while trying to answer this question, but I can't get a clear answer for it.
Background info:
I'm running El Capitan with a Windows 10 partition on my MBP that I created through Boot Camp. When I ran the boot camp assistant, I made sure the "Download latest support software from apple" box was checked. After that my computer rebooted and I installed Windows onto the newly created partition from a USB drive. I then booted into Windows, where an Installer for the Boot Camp Windows Software popped up. I installed it.
I've read on the internet that the Boot Camp Support Software allows read-only access to the Macintosh HFS+ partition, BUT windows does not recognize the partition, I can't even read from it. Why is this? Is what I read wrong? Or is there a different thing I need to install that's not the software apple put on my Windows Install USB? Or is this feature simply not supported in Windows 10?
I can't figure out why this drive is not accessible to me even though a bunch of places on the internet say that support is included in the Boot Camp Support Software, which I'm fairly sure I installed
EDIT: I realize that there are other third party options to get both read and write support for HFS+, but I am specifically looking for an option built in by Apple.
Best Answer
I finally solved it!
This literally took hours out of my day, but I now know what the problem was. It turned out that the drivers actually were installed. by verified this checking for the presence of the following files:
The reason that the drive was unreadable is because they were encrypted with FileVault. I disabled FileVault in OS X, and when I booted into Windows again, the partition was mounted.
There might be a way to use FileVault and Boot Camp together, I'm not sure. I read in a few places, however, that if you enable FileVault after installing Windows with Boot Camp, you can have your drive encrypted and accessible from windows. (This is just a hunch however, I'll have to look into it more)