Both the schematic file and the PCB file are damaged. I could not even open them with a text editor. I’m also having problems with .rar files. If you want to share files with others, it’s much better to use a generic format.
Do you have a recent backup?
If you have a backup of your project, then it’s very likely the easiest way to restore your project. By default KiCad creates a backup directory in each project.
If you don’t have any backup, then Reverse engineering KiCad project from Gerber files is probably your next best option.
Apart from that. KiCad V6.0.1 is quite old, and there have been quite a lot of bug fixes in the last half year. A newer KiCad version is released approximately once a month and the current version is KiCad V6.0.7.