Using Cardinal type for pointer arithmetics causes segmentation fault on 64-bit machine about castlesand HOT 2 OPEN

The same issue happens when entering multiplayer from the main menu.
I've included backtrace and patch.

Hi.

We haven't designed KaM Remake to run on 64bit platforms yet:
 - the game is still maintaining Delphi 7 compatibility, which is still the most widespread Delphi version AFAIK. Delphi 7 does not have NativeUInt type.
 - there is no actual need in doing a 64 bit version of the game, 32bit works just fine and adding 64bit will also mean maintaining more sophisticated code.
 - there are no advantages in going 64bit for the game, there are no memory allocations that need 64 bit address space.
 - there are numerous places in code that assume Pointer=Cardinal (especially savegames and multiplayer)

Said that, if you are really interested in maintaining 64 bit compatibility:
 - please look throughout the whole code to estimate the size of the refactoring required.
 - keep in mind that this is optional job and you will be doing it just for your own pleasure.
 - start off with adding "NativeUInt" type to KM_CommonTypes wrapped into IFDEF for older 32bit versions of Delphi that don't have "NativeUInt" type.