Is there anyway to embed (customise) the icon for a particular Word document?

I have created a library of Word document templates for use by members of my work team. I want to make it as easy to use as possible which as why I want to customise the icons for each template eg report template, work request template etc. Now I know that you can edit the icons for Windows but these are controlled by a icon -> Document types mapping. I understand that it is possible to embed icons into a particular file to overide the WIndows default. Photoshop for example enables you to create a thumbnail of that file's image contents. Does anyone know of a freeware utility (preferrably) that can edit a file (not file type) icon?

 

I have done this once or twice with MicroAngelo but the app is not free and you have to careful with some file that you do not
corrupt their structure eg old and new icon sizes not the same.
There are some free icon editors/managers around but I do not know if they can do what you want.
regards