32bit Windows fread 4GB limit

AFAIK, there is none.

Only solution would be using 64bit processes, and that involves making your app 64-bit only.

Part of the issue is that the 32-bit fread implementation uses unsigned 32-bit types..Which means naturally, to bypass that, you need 64-bit implementations.

To get beyond it in windows you may need to do some nasty things.
Actually you need to create your own 64bit variants of fread fwrite and fseek
fseek you might start from this MS fun bit of crude

Win32 is partially the limitation it's actually MS's library.
fseek64(long long unsigned int) might be what you wish to create. I am not sure you want to make your own 64 bit streaming libraries or not. I don't know off hand how many extended libraries there are for VC++/ (VS 2005 .NET confusion).

Cyb