One of my friends is into retrocomputing, and he wondered what happened on MS-DOS if you asked it to access a file on a network share that was bigger than what FAT16 could express. My friend was under the mistaken impression that when MS-DOS accessed a network resource, it was the sector access that was remoted. Under this model, MS-DOS would still open the boot sector, look for the FAT, parse it, then calculate where the directories were, read them directly from the network hard drive, and write raw data directly to the network hard drive. This is not how it works. Raymond Chen is an international treasure.