Remember, on a Mac it's not an Enter key, it's a Return key. It's not used to enter a file. On Windows, you use Ctrl-O to open a file from within an open progr

Remember, on a Mac it's not an Enter key, it's a Return key. It's not used to enter a file. On Windows, you use Ctrl-O to open a file from within an open program. On a Mac, you use Cmd-O to open everything from everywhere; it's a universal (within Apple) convention applied consistently.