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I need to be able to take formatted text and convert it to some form of plain text, but then be able to take that plain text and convert it back to the formatted state. The plain text must therefore keep all the information about the formatting.<br />
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eg save the contents of a RichTextBox in a .txt file<br />
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or e.g. take the formatted text and save it as html <br />
the html root seems the most promising at this stage.
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I need to be able to take formatted text and convert it to some form of plain text, but then be able to take that plain text and convert it back to the formatted state. The plain text must therefore keep all the information about the formatting.

eg save the contents of a RichTextBox in a .txt file

or e.g. take the formatted text and save it as html 
the html root seems the most promising at this stage.

VB.net Excel Add-in or VBA   Save formatted text as plain text

Visual Basic .NET (VB.NET) is an object-oriented programming language implemented on the .NET framework, but also supported on other platforms such as Mono and Silverlight. Microsoft launched VB.NET as the successor to the Visual Basic language. Though it is similar in syntax to  Visual Basic pre-2002, it is not the same technology,

Visual Basic.NET

Microsoft Excel topics include formulas, formatting, VBA macros and user-defined functions, and everything else related to the spreadsheet user interface, including error messages.