It reduces the temporary storage space required on your hard drive or SSD during the installation process. Common Errors Related to fg-optional-mp-files.bin
If the installation process errors out specifically when unpacking multiplayer components, your local antivirus solution or Windows Defender has likely flagged the temporary extraction folder. To bypass this:
Background Windows processes can interfere with heavy decompression tasks. Restart your PC into . Run the installer. fg-optional-mp-files.bin
If you need help with a specific game or a particular error code during your installation, let me know: What is the or code displayed? What game are you attempting to install? How much system RAM does your PC have?
This is normal. If you want these features, you will need to re-download the fg-optional-mp-files.bin and run the installer again (selecting the file this time). 2. Can I delete fg-optional-mp-files.bin after installing? It reduces the temporary storage space required on
You want to prevent any unexpected internal dependency errors during the installation process. 🛠️ How to Handle and Verify the File
Never delete or modify cache files while FlightGear is running. Restart your PC into
Run the Verify BIN files before installation.bat tool included in the download folder. This script hashes your downloaded files against the original upload to check for corruption. If fg-optional-mp-files.bin fails the check, rehash the torrent in your client to redownload the corrupted segments. Error: "Multiplayer option is greyed out in the installer"
Are you intending to play or multiplayer/co-op ?
Once the installation wizard finishes completely and the game launches successfully, all .bin files and the setup.exe can be safely deleted to free up hard drive space.
If you chose to skip downloading fg-optional-mp-files.bin , the verification tool will naturally tag the file as This is perfectly normal and will not cause an issue. However, if you did download the file and it returns a "BAD" or "CRC Mismatch" error, the file is corrupted and must be rehashed or redownloaded via your torrent client. ❌ Common Troubleshooting Steps 1. The Installer Freezes or Throws a Checksum Error