A: No. Save files are local to the host PC. They would need to send you their .sav file via Discord, you edit it, and send it back.
Stored in specific byte arrays. For example, a maxed-out character might look like 19 19 19 19 (hex for 25) in the stats section. castle crashers save editor steam
Always back up your original save file before using an editor. Copy the savefile.sav file to your desktop. you edit it