Identify whether the application ever starts
A launch failure before the player opens is a different stage from a video that opens with no picture. Record the exact message, Windows version and mpv.net package. Keep the downloaded release identity rather than relying on the filename of a desktop shortcut.
Preserve the previous working configuration and any package needed for a controlled recovery. Do not delete the media library or install a codec pack while the executable itself is not starting. The first question is the application’s actual platform and runtime requirement.
Read the selected release’s change history
The project changelog records transitions in its required .NET version and the move to .NET 10 LTS. It also documents the earlier Windows-support change. Check that actual release history and current manual rather than assuming an old runtime remains sufficient.
Use Microsoft’s official Desktop Runtime route linked by the project and match the actual requirement. An installed SDK or a similarly numbered unrelated runtime is not evidence that the requested component is present. Keep architecture and package identity in the comparison without guessing from the computer’s marketing name.
Retest launch before opening media
After an authorized supported dependency correction, launch the actual player normally and inspect its version information. Record that result before opening the known local sample. A successful launch is an important milestone but does not establish media compatibility.
If the launch still fails, retain the exact new error and the relevant installed component. Do not repeatedly swap portable and setup builds without recording which executable was tested. Several copies can hide the fact that a shortcut still targets the old path.
Keep support conclusions tied to the observed stage
Once the player opens, test one known authorized local file with the preserved baseline. If that later test fails, investigate the media and output route separately. A successful runtime installation is not a universal playback repair.
The expected outcome is an identified launch prerequisite and a repeatable supported application start. It does not make a current release support an older Windows version outside the project’s requirement or claim a hands-on account test. Keep the release, dependency and first failed stage with the support case.
Questions answered
Should I diagnose a codec when the application never opens?
First resolve the actual launch and dependency stage. A codec test requires a running player.
Which requirement should I follow after an upgrade?
Use the selected release’s current manual and changelog, not the runtime remembered from an older installation.
Sources & further reading
Official references for the subjects discussed. Service terms and device software can change.