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My company has developed an text editing .ocx control. We added a "Insert OLE Object" function in the control to insert files like MS-Word and MS-Excel. We implemented this function by calling API provided by Microsoft. It works fine for displaying normal content in work like text and pictures, but the math equations in a Word can't be displayed and, instead, a line of '?' is displayed.
Original Word
OLE object inserted in my Control
A family of Microsoft word processing software products for creating web, email, and print documents.
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Answer accepted by question author
You've already received a response to your identical question at https://answers.microsoft.com/en-us/msoffice/forum/all/inserted-ole-object-in-my-own-control-fails-to/d10c37c7-7a78-40f6-a1de-6d0bbb6adae6.