Genuine system files usually reside in C:\Program Files . If you find this file in C:\Users\[YourName]\AppData\Roaming or a temporary folder, it is likely malicious.
If you are writing a report or documentation for this file, you can use the following template: ffmpeg23exe
Because ffmpeg23.exe is a common target for "missing file" error searches, be cautious of third-party "DLL fixer" or "driver update" sites. Only source this file from official NCH Software downloads or trusted archives of their installers to avoid malware. Genuine system files usually reside in C:\Program Files
If you are concerned, right-click the file and select "Scan with [Antivirus Name]". ffmpeg23exe