For the original retail version or the GOG.com release, save files (usually named single_0.sv single_1.sv , etc.) are typically found in: GOG Version: C:\Program Files (x86)\GOG Galaxy\Games\Diablo\ (or wherever you installed the game). Original CD Version: Often stored directly in the installation folder, e.g., C:\Diablo\ VirtualStore (Windows Vista/7/10/11): If the game was installed in Program Files
Older versions often stored files in the game directory or within the Windows system folders due to older permissions: C:\Program Files (x86)\Diablo diablo 1 save file location
On Windows, Diablo 1 save files are typically stored in the following location: For the original retail version or the GOG