Michael Carl

You're right, opened directly in ISE just fine. What a dumb mistake. Thanks for the help!

Ah that makes sense. So why does it keep reading it as a vhd file? And how do I open it properly?

I'm trying to open .vhd files from here: https://opencores.org/project,sigma_delta_dac_dual_loop with 7-zip, but I keep getting an error that says "Couldn't Mount File: The disc image file is corrupted." I'm running Windows 10 (64-bit). Does anyone know what I'm doing wrong?