Problem: 

The results can be duplicated without during standard web browsing when the user is attempting to open any PDF, not only a PDF inside EzParts Electronic Parts Catalog Software .

 

PDF documents are not displayed in IE10 on Windows 64-bit while browsing a manufacturer's parts catalog using EzParts Electronic Parts Catalog Software.

Solution:

Win 64-bit has two shortcuts for Internet Explorer: IE and IE 64-bit. User was trying to display pdf documents in IE 64-bit with Adobe Acrobat for 32-bit Win. All these caused the conflict of versions (IE10 and Adobe Acrobat)
To solve the issue – use shortcut for IE10 32-bit.