Tested and works here, Although I had to copy the d3dx9_30.dll from gamestudio
into EarthSculptor's plugins folder and rename it to d3dx9_36.dll.
I reckomend that the d3dx9_36.dll be included with the plugin.

Loaded the exported hmp into WED no problems.
I haven't tested the exported .hmp in my level as yet though.

I have a registered version of EarthSculptor Beta 1.05 and my map size is 1024.

Great contribution ecg_limey, looking forward to the final release..

Windows XP SP3
Intel Dual Core CPU: E5200 @ 2.5GHz
4.00GB DDR3 Ram
ASUS P5G41T-M LX
PCIE x16 GeForce GTS 450 1Gb
SB Audigy 4
Spyware Doctor with AntiVirus