Well use the generator image you can find on the pharo repo, it is hard to build such an image by hand.

This code:

Primitives lookupDirectory: encodedPath filename: encodedBasename

Should be:

FilePluginPrims��lookupDirectory: encodedPath filename: encodedBasename

Now I don't why this was not correct (File management is pure magic to me).

I would recommend you to post question about VMMaker not in this mailing list, because few people can answer here, but instead in the pharo-dev mailing list OR Squeak-vm-dev.

Have fun with VMMaker

2013/11/29 Nicolai Hess <nicolaihess@web.de>

Looking at the code for DiskStore>>basicEntryAt:
I find this code:
"Primitives lookupDirectory: encodedPath filename: encodedBasename)"
What is this "Primitives" not a class? I am suprised there is some code
that I can not find the source for.

Ok, it has something to do with vm primitives, and I know that code like
<primitive: 'primitiveDirectoryEntry' module: 'FilePlugin'>
is in the vmmaker-package for FilePlugin.

BTW it is terrible hard to load vmmaker in a "normal" image. Now I use
the generator.image from pharo http://files.pharo.org/vm/src/.
But even in this image it is not possible to load the vmmaker tool.