You can save your Final Draft file as an RTF file, then open it in the other program.
FD13 / 12 / 11: Go to File > Export Document (Windows) or > Export Script (Mac);
FD10 / 9: Go to File > Export;
Under Save As Type (Windows)…
...or File Format (Mac)…
...select Rich Text Format (RTF) and click Save.
This will save a .rtf version of your script that can be opened in Microsoft Word or any word processing program that recognizes RTF files.
NOTE: While this will retain the script formatting, some other features such as scene numbers, headers, and A pages will not translate.
Final Draft can also export a script as a PDF file that can be opened and read in any PDF viewer. See: How do I save my Final Draft file as a PDF?
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