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I'd like to see something like Carbon for old apps so that they boot in modern window frames (without the missing Tahoe corners) and can save to files.

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Advanced Mac Substitute stores documents and preference files in sandboxed host directories.

For example, check out the MacPaint demo:

https://www.v68k.org/advanced-mac-substitute/demo/MacPaint-A...

If you were to double-click the Hello document in macOS' Finder, it would launch and open in MacPaint.app.

This is exactly the sort of project that can serve as the basis for such a system.

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