Could you run this query on your database:
SELECT o.Name AS ObjectName,
o.type AS ObjectType,
s.name AS SchemaOwner,
ep.name AS PropertyName,
ep.value AS PropertyValue,
c.name AS ColumnName,
c.colid AS Ordinal
FROM sys.objects o INNER JOIN sys.extended_properties ep
ON o.object_id = ep.major_id
INNER JOIN sys.schemas s
ON o.schema_id = s.schema_id
LEFT JOIN syscolumns c
ON ep.minor_id = c.colid
AND ep.major_id = c.id
WHERE o.type IN ('V', 'U', 'P')
AND ep.name NOT LIKE 'MS_%'
ORDER BY SchemaOwner,ObjectName, ObjectType, Ordinal
I tested it on our adventureworks (SQLServer 2005) and it doesn't contain any extended properties, other db's do.
Btw, we do filter out 'MS_*' extended properties, as those are in general a big pain as they're in general large crufty pieces of text/garbage not really usable.
I do see that adventureworks tables have MS_Description extended properties... Are you looking for those, perhaps?