stvoy-save-editor

Save game editor for Star Trek Voyager: Across the Unknown by Gamexcite / Daedalic Entertainment. Read and modify resources, hull integrity, and more.

No save editor existed for this game — the save format is a proprietary bit-packed binary (C3Serialize/FunIO), not standard Unreal Engine GVAS. This toolkit reverse-engineers that format so you can tweak your saves.

Requirements

• Python 3.8+
• No external dependencies

Finding Your Saves

Save files are located at:

C:\Users\<YourName>\AppData\Local\STVoyager\Saved\SaveGames\<SteamID>\

Files are named 00_GX_STV_SaveGame_NNNN.sav.

Quick Start

# View save file info and chunk structure
python stvoy_toolkit.py info path/to/save.sav

# List all resources and their current values
python stvoy_toolkit.py resources path/to/save.sav

# Check current hull integrity
python stvoy_toolkit.py hull path/to/save.sav

# Set hull integrity to 490
python stvoy_toolkit.py set-hull path/to/save.sav 490.0

# Set a resource value (e.g. give yourself 10000 Dilithium)
python stvoy_toolkit.py set-resource path/to/save.sav Dilithium 10000

What You Can Change

Resources

Base resources like Crew, Energy, Food, Deuterium, Dilithium, Duranium, Tritanium, Morale, SciencePoints, BioNeuralGelPack, BorgNanites, Batteries, and more.

Items and recipes like Items.Item.ResearchPoints, Items.Item.Item_Torpedo, etc.

Run python stvoy_toolkit.py resources <save> to see the full list for your save.

Hull Integrity

Current hull can be set to any float value. Note that max hull capacity is computed from your installed ship modules and is not stored in the save file, so you can't increase it directly — but you can repair to full.

How It Works

Save files are Base64-encoded. Under that is a 16-byte header (file size, CRC32 hash, version, debug flag) followed by a bit-packed binary stream using C3Serialize/FunIO encoding. Values are stored as variable-length packed integers (smaller numbers use fewer bits), so modifying a value may shift everything after it. The toolkit handles all of this automatically — including bit-stream reconstruction and hash recomputation.

Backup & Safety

The toolkit automatically creates a .backup copy of your save the first time you modify it. Keep your own backups too — copy your entire SaveGames folder before experimenting.

Limitations

• Max hull can't be changed — it's computed from installed ship modules, not stored in the save
• Not all chunks are decoded — only resources (cser) and hull integrity (tsnc) can be edited currently
• Chunk structure for crew (hero, dpsr), quests (ques), events (evnt), etc. is mapped but not yet editable

Disclaimer

This project is not affiliated with or endorsed by Stellar Cartography, Strange New Games, or any rights holders of Star Trek Voyager: Across the Unknown. Use at your own risk.

License

MIT