Ok, Verci convinced me to release that thing after I had it for a few days.
Now, this is a compilation of three text files which contain the decompiled information from descr_items.db
Here's a quick walkthrough to adding a new building into descr_items.db using this:
1. Extract the file you need (BI or 1.5) to your data directory
2. Backup descr_items.txt
3. Rename the file you extracted to descr_items.txt
4. Add to the beginning any Includes you want made, I recommend using this to add new buildings (you can see a readme on that in the original descr_items.txt)
5. Add your new building entries
6. Delete descr_items.db
7. Start the game
8. You get tons of error message (normally if you use show_err), either click through them or just hit ctrl+alt+del and kill the game process, but descr_items.db is generated anyways
9. Restart the game and enjoy
If you want to use that in a mod folder, you have to extract the RTW item files you want to use there in order for the game to find them.
If you don't want to use a building that is in that file, just delete the entry.
//edit: Sorry, I uploaded the wrong version, the ones I attached don't work. I'll update them as soon as I can.
//edit2: Ok, the clean and proper files are now in there.