Icewind Dale: Heart of Winter is the expansion to the classic Black Isle game Icewind Dale.
This expansion pack for the original Icewind Dale added some technical improvements (developed by Bioware for Baldur’s Gate II) as well as a new campaign, with new monsters, new characters, new XP limits, etc.. The expansion was generally received favorably, except that many complained that it was too short. In response, Interplay released a second expansion pack called Trials of the Luremaster for free if you had Heart of Winter.
The game came in a standard one piece large box. Although it’s designed to look like a book, there’s no gatefold cover this time. Icewind Dale was recently re-released in an enhanced edition along with both expansion packs, so if you’ve never played the game before, you might want to check out that version.