The primary file that contains your character's data is the file. While other files like .map (minimap data) or .key (custom key bindings) exist, the .d2s file is the only one strictly necessary for transferring a character between patches or game versions.
If you update your game and your characters disappear, they are likely still in the old installation folder. To "patch" your saves into the new system, manually copy everything with your character's name (specifically the .d2s file) into the new folder. 2. File Compatibility and the ".D2S" Format diablo 2 lod character save files patched
If you have a "Classic" character from pre-LOD days, you can still open it in LOD (or D2R) and use the Convert to Expansion button on the character select screen to unlock Act V and expansion items. Critical Changes in Recent Patches The primary file that contains your character's data
Udie Too 2.6+ explicitly includes a "Convert to 1.14" button. It can read damaged saves and repair checksums. Fixing "Bad Character Version" errors. To "patch" your saves into the new system,