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Description
Tested versions
System information
Non OS related
Issue description
Switch the project extension from .godot to .redot
We could support both, or we could leave this issue open until we have a breaking separate us from the Godot engine so we apply it, or we just save a new project in .redot and add migration guide and one step in it to change the extension to .redot
Steps to reproduce
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Minimal reproduction project (MRP)
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