Apple Macintosh: Is the "File System Manager" Extension available anywhere?

I'm using the Basilisk II (68k Macintosh) emulator with MacOS 7.0 and 8.0. File system sharing (between host and guest) works fine with 8.0 but I also want to use it with 7.0. According to the manual, to use file system sharing with MacOS 7.0 or 7.1, you have to install the "File System Manager" extension in the guest operating system. (Newer MacOS versions do not require the extension.) Is there…