The custom resolution hack doesn't work because the EXE is packed using Neolite.
To unpack the RCT.EXE file:
1. Download a tool called RLdePacker v1.4, Google is your friend.
2. Extract the RLdePacker v1.4 tool.
3. Copy this file to your desktop or somewhere:
C:\Program Files\GOGcom\RollerCoaster Tycoon Deluxe\RCT.EXE
* NOTE: Install directory may be different than above, adjust accordingly.
4. Launch RLdePacker v1.4 and load into it the RCT.EXE file.
5. Leave all the RLdePacker v1.4 options as default and click UNPACK.
6. If it reports unpacking was successful, then you should have a new unpacked EXE file called unpacked.exe in the same directory as the original.
7. Rename the original RCT.EXE to RCT.BAK or delete it.
8. Rename the new unpacked.exe to RCT.EXE
9. Proceed with the following hacking steps for fullscreen resolutions (Maximum fullscreen resolution is 1280x1024):
www. wsgf .org/dr/rollercoaster-tycoon
10. For 1080p Windowed support, do not use the codes from the above link, instead replace the below hex which I found myself using a debugger:
0500007E07C745FC000500 --> 0780007E07C745FC000780
0400007E07C745F4000400 --> 0438007E07C745F4000438
This will change the maximum supported windowed resolution from 1280x1024 to 1920x1080 as per
the below table:
----------------------------------------------------------------------
0500 HEX == 1280 DEC | 0780 HEX == 1920 DEC
0400 HEX == 1024 DEC | 0438 HEX == 1080 DEC
-----------------------------------------------------------------------
* NOTE: The Windowed Mode HEX codes you will find on the internet DO NOT WORK on this unpacked GOG version (Fullscreen HEX codes do work as they are identical in the GOG version).
** NOTE: RLdePacker v1.4 would not unpack the EXE on Windows 7 during my attempts, in the end I resorted to a Windows XP machine, but maybe Windows XP Compatibility mode on Windows 7 may work.
11. After following above guide and hex editing in the new resolution, copy the new RCT.EXE into the installation folder, in my case:
C:\Program Files\GOGcom\RollerCoaster Tycoon Deluxe\
Enjoy your new hacked display resolution.
P.S. Please don't ask me to send you the unpacked or pre-hacked EXE, all the information you need to do it yourself is above.
Mike
Post edited January 23, 2014 by merlinmike