Some antivirus programs quarantine legitimate game files, especially modded executables, because they alter memory (a behavior similar to malware).
Yes and no. The error itself prevents launch, but once fixed, if you’re using an outdated modded executable, you may be banned from online servers or unable to connect. Always match the official game version for multiplayer. unknown file version dbxv2.exe
For the unmodded player, the error signifies a disconnect between your Steam client and the files on your disk. especially modded executables
Example for Windows Defender: