This issue occurs because the Acrobat Reader ActiveX control that is used to handle PDF documents is only available as a 32-bit version. Instead, the webpage in the application cannot load the Adobe Reader ActiveX control, and the webpage displays only a white page with a black "X" symbol. In this scenario, Adobe Reader does not start. You try to open a PDF document by using the WebBrowser control in the application. Internet Explorer 11 or Internet Explorer 10 and Adobe Reader are installed on the computer. You develop a 64-bit application that hosts a WebBrowser control. For more information, see Internet Explorer 11 desktop app retirement FAQ.
Warning: The retired, out-of-support Internet Explorer 11 desktop application has been permanently disabled through a Microsoft Edge update on certain versions of Windows 10.
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