Table of Contents
Who this is for: Game modders, developers, and curious players wanting to understand FNF’s file structure and create custom content.
Ready to jump in? Play friday night funkin games and experience the rhythm game that started it all.
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Understanding Friday Night Funkin File Structure
Friday Night Funkin is built using HaxeFlixel, which compiles to different formats depending on the platform. The decompilation process varies significantly based on whether you’re working with Flash SWF files, executable builds, or source code repositories.
Decompiling SWF Files (Newgrounds Version)
For the original Newgrounds Flash version, you’ll need specialized SWF decompilation tools:
- JPEXS Free Flash Decompiler – The most reliable option for extracting ActionScript code, sprites, and audio from SWF files
- SWF Investigator – Alternative tool that provides detailed file structure analysis
- Flare – Command-line decompiler for batch processing multiple files
Simply load the FNF SWF file into JPEXS and navigate through the folder structure to access sprites, sounds, and code segments. The ActionScript 3 code will be displayed in a readable format, though some obfuscation may be present.
Working with Compiled Executables
Decompiling Windows or Mac executables requires different approaches:
Windows .exe Files
- Use x64dbg or IDA Pro for assembly-level analysis
- Resource Hacker can extract embedded assets like images and sounds
- HaxeFlixel executables often contain embedded Flash content that can be extracted separately
Asset Extraction
Many FNF builds store assets in accessible formats:
- PNG files for character sprites and backgrounds
- OGG or MP3 files for music and sound effects
- JSON files containing chart data and metadata
These can often be found in the game’s installation directory without requiring decompilation tools.
Source Code Analysis
Since Friday Night Funkin is open-source, the most effective approach is examining the official GitHub repository. This provides:
- Complete HaxeFlixel source code
- Asset organization and file structure
- Build scripts and compilation instructions
- Documentation for modding and customization
Legal and Ethical Considerations
Always respect intellectual property rights when decompiling games. Friday Night Funkin’s open-source nature makes this process more straightforward, but be mindful of:
- Music licensing restrictions
- Character artwork copyrights
- Proper attribution requirements
Tools and Software Requirements
| File Type | Recommended Tool | Difficulty Level |
|---|---|---|
| SWF Files | JPEXS Free Flash Decompiler | Beginner |
| Executable Files | x64dbg + Resource Hacker | Advanced |
| Asset Extraction | File Explorer | Beginner |
| Source Analysis | Git + Code Editor | Intermediate |
Successful decompilation opens up possibilities for creating custom mods, understanding game mechanics, and learning from the codebase. If you’re interested in experiencing the original game that sparked this modding community, you can dive right into the classic version.
TL;DR
Friday Night Funkin files can be decompiled using JPEXS for SWF files, x64dbg for executables, or by accessing the open-source GitHub repository for complete source code analysis.
