Monster Hunter: World keeps its main Steam PC progress in SAVEDATA1000. Because the file sits under an account-specific Steam userdata tree, the account context belongs in the backup record. Copy the file outside Steam before major changes and keep multiple dated revisions rather than relying on cloud synchronization alone. A future editor must handle account/profile semantics explicitly; Phase 23 only documents where the file lives and how to preserve it safely.
For this PC reference, the documented storage is Windows: <Steam-folder>userdata<user-id>582010remote | Linux / Steam Play: Steam Play: <SteamLibrary-folder>/steamapps/compatdata/582010/pfx/. The known file or folder pattern is SAVEDATA1000. The Steam PC profile uses the SAVEDATA1000 file under app 582010 remote storage. The file contains account/profile progress and should be treated as user-associated data rather than an anonymous portable save.
Backup guidance: Copy SAVEDATA1000 to a dated location outside Steam userdata. For extra context, record the Steam account/ID that produced the file. Steam Cloud/remote storage is part of the normal PC workflow. Manual backups are still valuable because a damaged local revision can also synchronize. Launcher and cloud context matters because The save is under Steam userdata, not the Monster Hunter: World installation directory. The numeric user folder identifies the Steam account context.
Compatibility and recovery should stay conservative. Third-party save transfers often need Steam-ID-aware handling. This Game Hub does not claim that a SAVEDATA1000 file from another account is directly portable. If the expected progress is not visible, If progress is missing after a cloud conflict, preserve both the current remote/local file and any backup before trying replacement. Avoid repeatedly launching the game while deciding which copy is authoritative. SaveEditor.com only labels a game-specific editor as available when a separate linked Tool has a verified operational runtime; this reference page by itself is not an editor claim.