Items are originally in .itm format, but if I send you the file as such, it would have no name nor description (text is saved in different file - dialog.tlk). That is why it is exported in .tbg format. In order to install an item on your computer, you need to import it. I fear you'll have to download
Infinity Engine Editor Standard (IEES) or Infinity Engine Editor Pro (IEEP). IEES is for importing only (1.95MB), and IEEP (2.27MB) is for importing as well as editing. In order to run IEEP you'll need to download VB6 package (1.85MB) separately, for IEES you won't.
All of this is at TeamBG site (which is the link pointing to).
Now I recall that I can export Anduril in self-extracting .exe file, so you don't have to download any of those. But, item files on internet are almost always in .tbg format so you will need IEES or IEEP if you want to get any other items.
Sounds chaotic, doesn't it? Well, I'm mailing the .exe to you now. You only have to open it and point it to your BG2 installation. And click on "Import IAP into game"
Post in this topic if... anything happens. Don't mail me - I am more often on the forum than I check mail
.