Ensure you have Bedplay.7z.001 , Bedplay.7z.002 , and any other numbered parts.
The software will automatically find part .002 , .003 , and so on, to reconstruct the full file. Bedplay.7z.003
You don't actually "open" part .003 directly. Instead: Navigate to your folder containing all the parts. Right-click on Part 001 ( Bedplay.7z.001 ). Select 7-Zip > Extract Here (or "Extract to Bedplay/"). Ensure you have Bedplay