The term "Bootstrap WYSIWYG editor" probably refers to an HTML editor. As I can see, there are more than one. No matter what it is, I cannot believe that they work with anything but HTML; at best, I can imagine that some could work with some XML or other structured format (pure text would not be a problem for you, right? :-)), but, ultimately, they all have to represent the text as HTML.
From the other hand, you ".docx" means something totally foreign to the Web, not part of W3 standards; and I cannot believe that this standard (ECMA-376, ISO/IEC 29500) format of proprietary origin will ever become a W3 standard. But it does not mean you cannot use it. You use ASP.NET where you can solve all problems. Basically, you need to convert .docx to HTML. This is what it is:
Office Open XML[
^],
Office Open XML file formats[
^].
So, the Open XML format is publicly available, so you can read the document on the server side using .NET.
I would suggest the following steps: 1) think seriously if you really need Word documents; staying with HTML is always easier and covers the interests of most Web users; 2) in Word is really required, review supporting software:
List of software that supports Office Open XML[
^];
see also:
Standard ECMA-376[
^],
ISO/IEC 29500-1:2008 - Information technology -- Document description and processing languages -- Office Open XML File Formats -- Part 1: Fundamentals and Markup Language Reference[
^].
But first of all, with ASP.NET, you can use Microsoft Open XML Format SDK:
Download Open XML SDK 2.5 for Microsoft Office from Official Microsoft Download Center[
^],
Welcome to the Open XML SDK 2.5 for Office[
^].
—SA
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