Was a lot more trouble than I think is worth putting into a 27x22 icon, but, oh well, mission accomplished.
In the end I just did it with Photoshop after I learned a little about what extension the BMP was. It is still not completey "authentic" so to speak, as all extended bitmaps can be previewed with XP, and all I get with my file is an icon saying PSD.

At least it works.
