Many people don’t know that Microsoft provides an Installable File System (IFS) SDK kit for writing filesystem drivers. This SDK provides necessary info for writing a filesystem driver to manage Linux/OS X drives from Windows 2000, XP or 2003 Server. Stephan Schreiber wrote an Ext2 IFS driver for Windows which supports Ext2 and Ext3 with read/write operations and almost everything else available under Linux except access rights, defraging and some other minor things.
via osnews