kaled - 11:13 pm on Oct 17, 2008 (gmt 0)

I haven't studied this, but I think you will find that the filenames are effectively broken up into numeric strings and non-numeric strings. The numeric strings are then padded with leading zeros (to ten decimal places probably) and then recombined with the non-numeric strings. From that point onwards, normal string sorting rules will be applied.

It might be interesting to try using numerics with decimal points since no padding should be applied to the fractional part.

Kaled.