Sites offering "free binary downloads" without context are often malicious. Legitimate firmware is always free from the manufacturer or community project.
The MD-9600 (also known as Retevis RT-95, or similar) is a popular VHF/UHF mobile radio. Firmware files for these devices are typically .bin or .sgl and are provided by manufacturers or open-source projects like OpenGD77. md9600csv2571v5v2645bin free
If you want a detailed write-up for reverse engineering or analyzing md9600csv2571v5v2645bin, that would involve: Sites offering "free binary downloads" without context are
Do not download .bin files from unknown forums, file-sharing sites (Mediafire, Dropbox, Google Drive without verification), or torrents. These often contain malware or brick your device. Do not download
If you ran something like:
md9600csv2571v5v2645bin free
…that would try to execute that binary with free as an argument — unlikely to work unless that binary specifically accepts free as a subcommand.