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Game Hub / Save Reference

Fallout 4 Save Files & Tools

Fallout 4 PC save location, backup, file-format, launcher, cloud-sync, and compatibility reference. This Game Hub documents save-file facts without implying that a game-specific Save Editor is available.

PC

01 / Overview

Save reference at a glance.

Game Hubs separate documented save-file facts from actual Tool support. A Game Hub can be useful even when no custom editor exists.

Developer
Bethesda Game Studios
Publisher
Bethesda Softworks
Platforms
PC
Save extensions
.fos, .f4se

Fallout 4’s location is straightforward, but modded restoration is not. A base .fos file can reference content from plugins, and F4SE can add a paired cosave. The safest archive therefore includes the full save directory plus enough information to rebuild the mod environment. A failed load after moving PCs is not automatically evidence of file corruption; missing plugins, changed load order, or an absent cosave can be the real cause.

For this PC reference, the documented storage is Windows: %USERPROFILE%DocumentsMy GamesFallout4Saves | Linux / Steam Play: Steam Play: <SteamLibrary-folder>/steamapps/compatdata/377160/pfx/. The known file or folder pattern is *.fos
*.f4se (when created by F4SE). Base Fallout 4 saves use .fos. F4SE-enabled installations can create companion .f4se cosaves; preserving only one side of a modded save may remove script-extender state.

Backup guidance: Copy the complete Saves directory. On F4SE setups, keep matching .fos and .f4se files together and record the installed mod/load-order state. Cloud behavior depends on storefront. OneDrive may also synchronize the Documents tree if Windows folder backup is enabled. Launcher and cloud context matters because The standard Documents path is the primary Windows reference. Microsoft Store packaging can differ, so locate the active edition before restoring a file.

Compatibility and recovery should stay conservative. A clean base-game save and a heavily modded save have very different restoration requirements even if both use .fos. If the expected progress is not visible, If an apparently valid save crashes on load after migration, verify missing plugins and script-extender dependencies before replacing more files. Also check whether Documents is redirected by OneDrive. 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.

Compatibility note

A clean base-game save and a heavily modded save have very different restoration requirements even if both use .fos.

02 / Save locations

Where the save files are stored.

Paths are displayed only when they have been explicitly documented for this Game Hub. Environment variables and launcher-specific differences should remain visible instead of being silently normalized.

Windows
%USERPROFILE%DocumentsMy GamesFallout4Saves
Linux
Steam Play: <SteamLibrary-folder>/steamapps/compatdata/377160/pfx/

Launcher / edition differences

The standard Documents path is the primary Windows reference. Microsoft Store packaging can differ, so locate the active edition before restoring a file.

03 / File format

Files, extensions, and format notes.

This section documents only known file names and structures. Format notes can later connect directly to SaveEditor.com parsers, checksum engines, and converters.

Extensions

.fos .f4se

File names / patterns

  • *.fos
  • *.f4se (when created by F4SE)

Format notes

Base Fallout 4 saves use .fos. F4SE-enabled installations can create companion .f4se cosaves; preserving only one side of a modded save may remove script-extender state.

Launchers / stores

Steam / Microsoft Store / Xbox app

Cloud save notes

Cloud behavior depends on storefront. OneDrive may also synchronize the Documents tree if Windows folder backup is enabled.

04 / Tools

Actual linked Tool support.

No verified game-specific Save Editor is currently listed. This Game Hub remains useful for save locations, file details, backup guidance, and other linked utilities.

No active game-specific Tool is currently listed.

Planned and deprecated Tool records are intentionally excluded. The save-reference information on this page remains separate from Tool availability.

Browse all tools

05 / Backup

Protect the original before editing.

Save editing should be reversible. Keep an untouched copy outside the active save directory before replacing, converting, repairing, or modifying a save.

  1. 01
    Close the game.

    Avoid modifying a save while the game or launcher may still be writing to it.

  2. 02
    Copy the entire relevant save set.

    Some games use multiple files, profile folders, metadata, or companion files rather than one isolated save.

  3. 03
    Store the backup elsewhere.

    Use a separate folder or archive so cloud sync or the game cannot overwrite the untouched backup.

  4. 04
    Edit a copy, then validate.

    Follow the exact compatibility and processing notes on the Tool page before replacing the active save.

Game-specific backup note

Copy the complete Saves directory. On F4SE setups, keep matching .fos and .f4se files together and record the installed mod/load-order state.

06 / Troubleshooting

When a save is missing or rejected.

Start with reversible checks. Do not delete or overwrite the only copy while diagnosing a path, cloud-sync, version, or format problem.

Game-specific notes

If an apparently valid save crashes on load after migration, verify missing plugins and script-extender dependencies before replacing more files. Also check whether Documents is redirected by OneDrive.

A

Confirm the correct profile.

Games, launchers, and operating systems may keep separate save folders for different users, editions, or profiles.

B

Check cloud synchronization.

A cloud service can restore an older file or overwrite a local change. Preserve both copies before resolving a conflict.

C

Check Tool compatibility.

A matching filename does not prove a matching format. Verify platform, game version, extension, and Tool support state.

D

Restore the untouched backup.

If the game rejects a modified save, return to the original backup before attempting another change.

07 / FAQ

Fallout 4 save-file questions.

Answers are generated only from visible Game Hub metadata and actual linked Tool states, plus universal backup guidance.

Where are Fallout 4 save files stored?

The currently documented save locations are listed in the Save locations section above. Use the location that matches your platform or environment.

What save-file extension does Fallout 4 use?

The extensions currently documented on this page are: .fos, .f4se.

Does SaveEditor.com have a verified Fallout 4 Save Editor?

No verified game-specific Save Editor is currently listed. This Game Hub remains useful for save locations, file details, backup guidance, and other linked utilities.

Should I back up the save before using a Tool?

Yes. Keep an untouched copy outside the active save directory before modifying or converting the file. Some games use multiple companion files, so back up the relevant save folder when in doubt.

Are there cloud-save considerations for Fallout 4?

Cloud behavior depends on storefront. OneDrive may also synchronize the Documents tree if Windows folder backup is enabled.

Editorial review

Game-specific metadata on this hub was last reviewed on 2026-08-08. Individual Tool pages maintain their own verification dates and compatibility notes.

Verification notes

The standard Windows and Steam Play save locations were reviewed against current PCGamingWiki coverage. Format notes distinguish base .fos saves from optional F4SE cosaves.

Reference sources
  1. Reference 1 - www.pcgamingwiki.com

Related guides

Continue with reviewed save-file guidance.

Only reviewed, index-ready Guides explicitly related to this Game Hub are surfaced here.