Operating System File Errors & Solutions

Many "file errors" are not caused by the file at all, but by how the operating system handles it: which program a file type is associated with, who has permission to read or write it, and what metadata the file system stores alongside it. These guides cover the most common OS-level causes on Windows, macOS and Linux, plus virtual machine disk images that move between them.

If a file opens fine on one computer but not another, or you see "Access denied", "You don't have permission" or "The application can't be opened", start here.