Full-Text Search -- What Thesaurus does it use?

can't find a full-text search forum .. decided to post it here...

Here's what I find in documentation on FREETEXT

Generates inflectional forms of the words (stemming).
Identifies a list of expansions or replacements for the terms based on matches in the thesaurus.

Question: which thesaurus does it use? Because it definitely doesn't pick up on synonyms from the Office thesaurus..

nevermind... found the expansion/ignore files in
\Microsoft SQL Server\MSSQL.1\MSSQL\FTDATA\