Look at the autorun file.
For 64bit you will see the lines:
[AutoRun.Amd64]
open=sources\sperr32.exe x64
Also, on 64bit installs, on the root of the drive you will see this file:
Bootmgr.efi
Identify 32 bit or 64 bit Windows 7 installation folder?
Look at the autorun file.
For 64bit you will see the lines:
[AutoRun.Amd64]
open=sources\sperr32.exe x64
Also, on 64bit installs, on the root of the drive you will see this file:
Bootmgr.efi