Someone on the bochs-developers mailing list mentioned that they use a program called WinImage, from www.winimage.com to read and write disk images (floppy and hard disk). Winimage is a commercial product with a 30-day trial.
If anyone wants to write a tutorial, send mail to bochs-developers mailing list and volunteer.
This section was contributed by Luca Cassioli and Stanislav Shwartsman
I eventually found what all of you were looking for for a long time: a freeware, graphical, win32 compatible HardDisk image editor! It can handle a large variety of formats, but the one you need is VMWARE 2.0 PLAIN DISK: you can import/export to/from Bochs images COMPLETE DIRECTORIES!
You can find it at http://hp.vector.co.jp/authors/VA013937/editdisk/index_e.html
Ben Lunt wrote a set of utilities for Dos/Win32 to manipulate flat disk images.
You can find it at http://www.fysnet.net/mtools.htm
These utilities includes :
BOCHSRC.EXE "Bochs Resource" A utility to create/modify a Bochs resource file.
MKDOSFS.EXE "Make DOS FS" A utility to create a FAT disk image of specified size.
MCOPYF.EXE "Copy From" A utility to copy an existing file from a FAT disk image to the current directory.
MDEL.EXE "Delete file" A utility to delete an existing file from a FAT disk image.
MDIREX.EXE "Directory Extended" A utility to view a FAT disk images directory and FAT contents.
MGETIMG.EXE "Get Disk Image" A utility to create a disk image from a floppy (multiple formats).
MBOOTCD.EXE "Create a CDROM Image with boot options" Create a CDROM image capable of booting with only a ROOT and a single file.
MGETCD.EXE "Get Disk Image of Physical CD" A utility to create a disk image from a CD.
MCDINFO.EXE "Get CD Info" A utility to the info from a CD. Not much yet, but a little.