Why Can't My Qt 5.1.1 Application Start: "Platform Plugin 'windows' is Missing" Even Though It's There?

Qt 5.1.1 Application Startup Failure: Troubleshooting Platform Plugin Issue

When attempting to launch a Qt application in "Release" mode from a folder outside of Qt Creator, users may encounter an error message stating "Application failed to start because platform plugin "windows" is missing." Despite the error message, the platform plugin is present in the "platforms" folder of the release folder.

The issue stems from a missing file: libEGL.dll. Although the application reports the absence of other DLLs (e.g., Qt5Gui.dll), it fails to mention the missing libEGL.dll. Adding libEGL.dll to the release folder will resolve the platform plugin error.

Corrective Steps:

1. Locate libEGL.dll**: Navigate to the "bin" folder within the Qt installation directory (e.g., C:QtQt5.1.15.1.1msvc2012bin).
2. Copy libEGL.dll**: Copy libEGL.dll to the release folder where gui.exe is located.
3. Restart the Application: Launch the application from the release folder to verify that the error has been resolved.

Additional Tips:

• Ensure that the platform plugin folder (e.g., "platforms") is included in the release folder.
• Check the application's configuration files (e.g., .pro file) to ensure that the appropriate platform plugin is being loaded.
• If the issue persists, try rebuilding the application or reinstalling Qt.

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