Dual-booters have long been able to get at their Windows-formatted files, but Windows certainly doesn’t make it easy to go the other way ’round. Enter Linux Reader, a free Windows application that emulates the look and feel of the Windows XP Explorer and allows read-only access to ext2 and ext3-formatted drives, the most common formats for Linux installations. Linux Reader can also search through Linux images and mount images for browsing, and runs as a stand-alone application.
Linux Reader is a free download for Windows 98 and later.
There’s another tool that you can use, according to Jaba who commented on Tombuntu. It’s called fs-driver.