Character Save Files: Diablo 2 Lod

This is a deep technical guide to Diablo II: Lord of Destruction (D2LOD) character save files ( .d2s ). This guide covers the file structure, byte-level editing, the distinction between Open and Closed Battle.net characters, and the specific mechanics introduced in the patch 1.10–1.14 era versus the modern D2: Resurrected era.

.d2s

: The primary character save file (contains stats, skills, and inventory). .map : Contains the revealed map data for that character. .key : Stores hotkey configurations. .ctl : Control settings for the character. Technical Resources for File Structure diablo 2 lod character save files

• Keep regular backups—after major progress or before using mods.
• Keep a copy of the whole Characters folder, not just individual files.
• Maintain versioned backups (e.g., CharacterName_2026-04-07.d2s) to recover from accidental corruption.

• If present, mercenary class, level, equipment, and helmet flag.