Yes, Final Draft files are 100% cross-platform compatible.
The program installers are not. You must run the Windows installer on a Windows computer and the Mac installer on a Mac.
More information:
- Can I install my Final Draft program on my iPad?
- If I have Final Draft on a Windows computer (but don't own a Mac), can I still use the Final Draft Mobile App on an iPad / iPhone?
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https://fd.support/3P3qAsa