Because 1.14 removed TCP/IP hosting, patched saves now serve as time capsules. You can’t drop-trade between versions easily, but you can forward a 1.10 character through every patch to 1.14, preserving its original quest log and waypoints.
changed everything to comply with modern Windows security standards. If you’ve updated your classic LoD client, your files have likely moved to: %USERPROFILE%\Saved Games\Diablo II diablo 2 lod character save files patched