Whether you have a physical Windows medium (DVD, USB) or just the ISO file, sometime you just do not know if the Windows on this medium is 32 or 64 bit. But there is a very easy way to check besides installing it.
Here is how to how to check if your Windows medium is 32 or 64 bit:
- Open your Windows medium in Windows Explorer.
- Double click on the file autorun.inf
- Now, if you see the entry [AutoRun.Amd64] in the first line, than it is a 64 bit medium. If the line isn´t there, it is 32 bit.