Int64 = NativeInt; // only 53 bits at runtime
UInt64 = type NativeUInt unimplemented; // only 52 bits at runtime
QWord = type NativeUInt unimplemented; // only 52 bits at runtime
..
Comp = type NativeInt unimplemented;
NativeLargeInt = NativeInt;
NativeLargeUInt = NativeUInt;
You should NOT install TMSWebCoreFNCCorePkg.lpk but the install in the IDE is done with LCLTMSFNCCorePkg.lpk, LCLTMSFNCCorePkgDE.lpk. Same for FNC UI Pack with LCLTMSFNCUIPackPkg.lpk, LCLTMSFNCUIPackPkgDE.lpk,