If you have many .anydesk files, use a batch script with AnyDesk CLI (if available) or FFmpeg loop:
Windows batch:
for %%f in (*.anydesk) do ffmpeg -i "%%f" -c:v libx264 "%%~nf.mp4"
macOS/Linux bash:
for f in *.anydesk; do ffmpeg -i "$f" -c:v libx264 "$f%.anydesk.mp4"; done
If you are an MSP (Managed Service Provider) converting hundreds of support session videos, follow these workflows: convert anydesk video to mp4
If no direct conversion is possible: