Unity's Invalid DWORD (32-bit) value problem

Apparently, the Unity developers decided that it is good idea to store floating point values in the registry.
The registry does not support floating point, but you know what it does support? Integers. so let's use that!
So they did something like:
double f;
RegSetValueExA ( KeyHandle, ValName, 0, REG_DWORD, &f, sizeof(f) )

It is just that... double is 64-bit type. DWORD is 32-bit type.

Well, Windows doesn't care. For it, the type is just a label on the value, for readability. Internally, all the registry values are binary blobs. 

And that's why I had to implement 64-bit DWORDs.