本文解决Designer.exe因找不到或加载Qtplatform插件'windows'而导致的启动失败问题。通过设置环境变量QT_QPA_PLATFORM_PLUGIN_PATH指向PyQt5的plugins文件夹路径，成功修复此错误。
运行designer.exe文件保错
This application failed to start because it could not find or load the Qt platform plugin "windows"in “”, Available platform plugins are: minimal, offscreen, windows. Reinstalling the application may fix this problem.
解决方法
参考https://blog.youkuaiyun.com/a359680405/article/details/45074761
环境变量中设置pyqt5的plugins文件夹路径
QT_QPA_PLATFORM_PLUGIN_PATH
C:\ProgramData\Anaconda3\Lib\site-packages\PyQt5\Qt\plugins
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