SharePoint - Determine the Site Definition used to create a Site Template (.STP)

A SharePoint site template is basically a saved version the differences between a Site Definition and the current state of a site. I've read that Site Templates can only be applied to sites that use the same Site Definition that was used to create the template.

If you have an STP file, how do you determine which Site Definition was used to create the Site Template?

Use these steps to determine what site definition a site template was based on:

1. Save the .STP site template to a local folder.
2. Rename it to a .CAB file.
3. Extract the cab file.
4. Open the manifest.xml file.
5. There will be a TemplateID value in the section near the top (e.g. 1)
6. The TemplateID refers to a site defintion.
7. Open [12 hive]\TEMPLATE\1033\XML\WEBTEMP.XML.
8. Find the template name with the ID that corresponds to the TemplateID in the site template manifest file (e.g. )

I'm not sure why, but the site definitions are grouped so that you might not know exactly which site definition was used. For example, Team Site, Blank Site, and Document Workspace all share the same Tempalte ID (1). That should mean that a site template with that ID should be able to be applied to any of those 3 sites.