>>Counter question: why have you broken a feature which worked since at least 1988 on just about any PC network? I had file based systems on RPTI, Lantastic, at least two generations of Novell and three of Windows networks, over a period of at least fifteen years, and it worked flawlessly.
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>If I remember correctly the DOS-style record locking scheme utilizes usage of "phantom" locations within file beyond the 2GB limit. This inherently limits the file locks to under 2GB in size. Kind'a says "kludge" to me.

I can't claim to know the infernals of DOS or Windows - both are known to be full of kludges - but I'd bet that this trick wasn't employed by each of the networks I listed, unless they had to use OS-level locking.

Still doesn't matter, it worked for all those years, and in their infinite wisdom the Redmongers decided to break it and then refused to fix it, practically killing the whole ISAM spectrum of products, so they, what, wouldn't impede the sale of SQL server?