This is the holy grail of D2 modding. Look for the "Eastern Sun" subforum, specifically threads titled "CP (Community Patch) Saves" or "Tournament Character Dumps." These are usually clean, virus-scanned, and balanced for the latest patch (R6D).
Before we dive into save files, we must understand the beast. Eastern Sun (often abbreviated ES) is not a simple drop-rate tweak. It is a total conversion mod created by Perfect Cell (and later maintained by the community as Eastern Sun 3.0 ). Diablo 2 Eastern Sun Character Saves
: Stores the explored map data for that character. This is the holy grail of D2 modding
If you use the D2SE Manager for older versions, look in the Diablo II\MODS\ESR\save directory. look in the Diablo II\MODS\ESR\save directory.