file are read only . how to changed this file permission to write also.this file is locked.
It's just the standard Windows file attributes - so you can access them either via the Windows Explorer, or on the command line ...
https://docs.microsoft.com/en-us/windows-server/administration/windows-commands/attrib
You are running the project from the pack installation directory, which is why it's read only -- it's easier to experiment on a copy made to a writable location.
The Pack Installer makes copying the example projects easy .From uVision,