Error "Incorrect function"

This error message indicates the application tried to do something not supported by the disk, but all Magnus Box is doing is reading those files and directories. If this error happens for a normal local disk, then that is certainly supported functionality.

One possibility is that the disk driver is reporting this error message as a symptom of disk corruption when it fails to read sectors for those files.

• Check if it is possible to open the affected files in any normal app.
• Use the disk health tools on the device. In Windows Explorer > "This PC" > right-click the drive affected (shown in the error) > "Tools" tab > "Check for errors".