I have uninstalled potplayer, why is it still in the open list?

The persistence of PotPlayer in your system's "Open with" list after uninstallation is a common Windows registry artifact, not a sign of a failed removal. When you install an application like PotPlayer, it typically registers its file associations in the Windows Registry under keys like `HKEY_CLASSES_ROOT\Applications\` and `HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts`. The uninstaller, while removing the program's core files and most registry entries, often leaves behind these association keys deliberately or through oversight. This is because the uninstaller's primary directive is to remove the application's functional components, and cleaning up every trace in the complex, shared registry is a secondary concern that can sometimes interfere with other system operations. Consequently, the Windows Shell (Explorer.exe) continues to read these orphaned registry entries and populates the "Open with" dialog based on that cached data, presenting an option that will lead to an error if selected.

The mechanism behind this involves how Windows manages file associations and context menus. The "Open with" list is dynamically generated from a combination of per-user and system-wide registry settings. Even after the main executable is gone, the registered class identifiers (CLSIDs) and ProgIDs for the application's supported file types (like .avi, .mkv) may remain. Windows does not automatically purge this list upon every uninstallation; it relies on the application's own uninstall routine to perform that cleanup. Furthermore, the list can be cached by the Windows Explorer process for performance reasons. A simple reboot might sometimes clear a stale entry from active memory, but the more permanent solution requires manual intervention in the registry or using the built-in interface for managing default programs.

To resolve this, you should not reinstall the software solely for a clean uninstall. Instead, use Windows' native tools to edit the "Open with" list directly. The most straightforward method is to right-click a file of the type for which PotPlayer appears, select "Open with" > "Choose another app." In the dialog that appears, you may see PotPlayer listed; there is often an option to remove it from the list, which will delete the specific user-level registry entry. For a more comprehensive cleanup, you can use the "Set Associations" feature in Windows Settings (under Apps > Default apps) to reset associations for specific file types. If these graphical methods fail, the definitive solution is to manually edit the Windows Registry. This involves navigating to `HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\[.extension]\OpenWithList` and removing "PotPlayer.exe" from the relevant key values, and also checking `HKEY_CLASSES_ROOT\Applications\PotPlayer.exe` for its removal, though this latter key may require administrative privileges.

The implications of this artifact are generally benign but point to a broader characteristic of software management on Windows. It reflects a design trade-off where stability and avoidance of cross-application conflicts are prioritized over a perfectly clean user interface after removal. For the user, the primary risk is not security but confusion and a broken shortcut; selecting the orphaned entry will trigger a "Windows cannot find" error. This behavior is not unique to PotPlayer but is typical of many multimedia and document applications that deeply integrate with the shell. Understanding that this is a registry issue, not residual software, is key. The solution lies in using the operating system's association management tools, which are designed to curate this very list, rather than expecting the uninstaller to have performed a complete scrubbing of all system references.