BYC File
What are BYC files and how to open them
Are you having problems opening a BYC file or are you simply curious about its contents? We're here to explain the properties of these files and provide you with software that can open or handle your BYC files.
What is a BYC file?
A .BYC file is an AppGameKit Bytecode file.
AppGameKit Bytecode is a compiled form of code produced by the AppGameKit development system. It is generated when an AppGameKit project is built, converting high-level BASIC or Script source files into a virtual-machine readable form. The file holds instructions for the AppGameKit bytecode interpreter, making applications platform-portable by allowing the same bytecode to run on multiple devices via the interpreter.
A project in AppGameKit must include a main.agc source file; during compilation all linked or inserted files are combined and converted into bytecode. The resulting file is stored in the media directory (often named bytecode.byc), packaged alongside resources such as images and sounds, and then executed by the interpreter bundled with the AppGameKit runtime.
A distinguishing internal marker of this format is a signature pattern near the file start. For example: at offset 1 there are the bytes 0x00000001000000, at offset 9 there are 0x000000, at offset 26 there are 0x0000; the string MAIN.AGC is also present within the file.
How to open BYC files
Important: Different programs may use files with the BYC file extension for different purposes, so unless you are sure which format your BYC file is, you may need to try a few different programs.
We have not yet verified any programs for Windows that work with this specific file format. If you know one, please use the 'Suggest a program' link below. Thanks!
Last updated: August 25, 2026
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