DOS memory in WinXP

[KC]

I use a DOS program under Win98SE. This program uses
Extended memory (DPMI). Under Win98SE the program has
64Mbyte free mem to work with.

When I start this DOS program under WinXP the program
only has 16Mbyte to work with!

I have checked/changed the settings of the properties
screen (memory, etc) but nothing works. Does anybody now
how I can increase the free mem for this DOS program
under WinXP?

I sure hope somebody has the answer, then I finaaly can
start working with WinXP . . . .;-)