This application failed to start because it could not find or load the QT platform plugin

QT Release exe After file , Prompt when running file ： 
This application failed to start because it could not find or load the Qt platform plugin “windows”. 
Reinstalling the application may fix this problem.

The details are shown in the following figure  

Verified as generated platforms The corresponding file is missing in the folder , Now you can switch manually .

Yes Qt Search in the installation directory platforms file , yes plugins A sub file under the file , Will be one of the .dll Put the files in your own folder , This is what works .