Why Is My Qt 5.1.1 Application Failing to Start Due to a Missing Platform Plugin, Despite Having qwindows.dll?

Resolving Qt 5.1.1 Application Startup Failure Due to Missing Platform Plugin

This question addresses an issue encountered when starting a Qt application in "Release" mode, resulting in an error message indicating the absence of the "windows" platform plugin. Despite the apparent availability of the platforms folder containing qwindows.dll, the application still fails to locate the plugin.

Solution:

After extensive troubleshooting, it was discovered that the application was missing the libEGL.dll library. This library is required for graphical rendering and must be present for the Qt platform plugin to function correctly.

Verification:

To confirm the issue, check the application's folder structure for the presence of libEGL.dll. If it is missing, add it to the folder.

Additional Details:

• Renaming the platforms folder to "platform" does not resolve the issue.
• Other commonly reported DLLs (e.g., Qt5Gui.dll) are not necessarily indicative of libEGL.dll's presence.
• The error message does not always explicitly state that libEGL.dll is missing.

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