Added x64 Helper.exe so it can't get lost (recompilation of this is hard, needs Visual Studio 2005 for Windows 2000 support).
This is actually also stored in HelperEXEs.res.
Updated MyProg exe's and HelperEXEs.res. Used MS's MT.exe for this (example: mt.exe -manifest MyProg.manifest.txt -updateresource:..\MyProg-x64.exe;#1) since I don't have access to an installed VS 2005 anymore and trying to install it on 2012 R2 threw up a bunch of compatibility warnings so didn't do that.