Hi there.
If somebody is interested in, I'll share now my way how to bring items of 9.4 item.rdb into 9.1 format.
You need:
- an rdb-Tool for read&import rdbs (

of @

or

of @

)
- two new tables (create-queries included in this topic)
1. Create those two new tables using the queries
2. Load item.rdb and overwrite/insert them into dbo.Item_lines
3. Load item.ref and overwrite/insert them into dbo.Item_Reference
4. Make a backup of your current dbo.ItemResource (just to be safe xP)
5. use the "94_to_91_convert" query to combine them into 9.1 format.
You should now have a working 9.1 ItemResource.
Disclaimer: I won't give any guarantee :P
If you don't trust it, don't use it.
If you get any issues, tell me.
Greetz and have fun,
LamiaCore/InkDevil