"The operation can’t be completed because an unexpected error occurred (error code -1309)."

The macerror command for error -1309 returns:

Mac OS error -1309 (fileBoundsErr): file’s EOF, offset, mark or size is too big

This gives us a hint that the file we’re trying to work with is

actually too big for the filesystem to handle (a very big file indeed

considering that the old Mac HFS filesystem had a file size limit of 2

gigabytes, FAT32 is limited to 4GB and Mac HFS+ is limited to 8 exabytes –

so big as to be practically unlimited). We can’t do much about the

filesystem limit, but at least we can stop banging our heads against the

desk trying to figure out why that file won’t open.