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Hi @Anonymous 

>>>>>>1. Will the dwg files and their contents stay unaffected? 

They will stay unaffected on your Mac, you can copy (move) them to your new Windows machine and open (edit, save) them.

>>>>> 2. After uninstallation of AutoCAD 2022 for Mac (30 day trial version) from my Mac, will I still be able to attach my dwg files in emails or transfer them from my Mac to my PC so that they can be opened in systems that have the compatible AutoCAD version or higher? 

Yes, you can email them, copy across network, copy to external drives, etc.