In the last days I was curious to see if I can do something about Textarea control on Windows. And this seems to work as it is a standard Windows control.
so for next plugins we have this methods for TextArea:
WinRTFDataMBS(SelectionOnly as boolean = false) as string
WinInsertImageMBS(data as string, Width as Integer, Height as Integer)
Insert image works only for Windows 8 and newer. For older versions we could build something with pasting using clipboard.
The RTF functions can read/write the content of the text area as RTF. This includes embedded images which you can't handle with Xojo's built in RTF functions.