Yes, but not directly. Final Draft 7 / 6 / 5 can open a script created in FD9 / 8 but the script must be saved in a particular way by the FD9 / 8 user first. The FD9 / 8 user must go to File > Export (FD9) or File > Save As (FD8) and choose Final Draft 5-7 document (.fdr) as the file format.
This command will create another copy of the script that is openable by older versions of Final Draft.
FD 7 / 6 / 5 all use the same FDR file format and no file conversion or alternate saving methods between them are necessary.
FD9 / 8's FDX file format is XML and makes it possible for Final Draft to be used on mobile devices. The old FDR format cannot be used for these purposes.
NOTE: All support for Final Draft 7 and older has been discontinued.
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