I've seen that Mac Drive 7 adds HFS+ and HFS support to windows for both hard-drives and CDs, which includes handling problems like the mac partition format. Clearly that must mean that file system support in windows is extensible somehow, even if it is slow. So where could someone start to write a simple (or not) file system driver for windows? I'm having a lot of trouble googling for this because these are commonly used words.
You need the Windows Driver Kit (WDK). The Installable File System Kit which is part of the WDK should get you started.
Good luck!
The IFS actually primarily permits you to write file system filter drivers. It does not directly contain support for new file systems. It is necessary for doing so, but you will need to obtain a large amount of additional, complex, hard to find information about Windows File Systems from third parties.
Please be aware that a File System driver is the most complex, undocumented thing you can do in the Windows kernel. If you have no prior kernel experience but you have say ten years experience programming operating systems in C, you are looking at two to three years full time work to produce a file system driver.
来源：https://stackoverflow.com/questions/668940/add-or-extend-file-system-support-under-windows