There is a short story on how to use this beautiful tool.

First, you need to copy IMAKER.EXE to the folder which contains files for the
distribution (including KERNEL.MNT of course). Second, you need to set HIDDEN
attribute to those files you don't either need or want to include to the image
(might be some undone work or something else, but first of all this applies to
IMAKER.EXE). Third, and the latest one, - launch IMAKER.EXE ;)

Simple enough, yeah? :)

After it has done its work, there is MSETUP.EXE in the same folder (made
HIDDEN to prevent it being included into the image)

Bootsector is taken from the russian distribution but you may recompile IMAKER
with another one. As you also may notice, STUB.EXE is included (using FILE
directive) into the IMAKER.EXE, so you need to compile it before IMAKER.

One note left: IMAKER adds to the image only files in the current folder, no
subfolders are proceeded.

Well, that's all. Ask if you didn't understood something 8)