I know there are many posts about this problem (i've read them all).
But i still have a problem with my exe, still cannot be opened.
I've tried to put the qwindows.dll (i tried with 3 different qwindows.dll) in the folder dist with my exe but doesn't change anyhting.
I've tried with libEGL.dll, nothing.
Any suggestions ? Is there a way to avoid having this problem ?
For me it was enough to copy qwindows.dll to platforms folder, like @Inktvisje wrote.
And don't repeat my mistake: don't download this dll from Internet! Copy it from your Python libs folder: YourPythonFolder\Lib\site-packages\PyQt5\plugins\platforms.
Qt platform plugin 'windows' - py2exe