This works for almost everything in Windows 10. As an example, if you want to open RTF files into Office Word, then you can follow the same and select Word as the default application.

However, if your users don’t use, or rarely use, Word to open RTF or HTML documents, you may be better off blocking those files from loading in Word altogether.

Other suggested workarounds included making Word open RTF files in Protected View, reading emails in plain text and using Microsoft Office File Block to prevent the opening of RTF files in Word ...

How to Write an RTF File. The Rich Text Format extension refers to a document-based file format used and recognized by prominent word processing applications. However, businesses may opt to rely ...

Open the Rich Text File by double-clicking the file icon or link. The file opens in a Microsoft Word window. Right-click the image and then click "Save as Picture" to open the File Save dialog box.

While .rtf files are not the default for Microsoft Word — the default is .docx or .doc — this is not a strange or unusual type of document. RTF stands for rich text format.