Is it possible to mount the NTFS and registry hives from a 64-bit Windows on a 32-bit Windows Preinstallation Environment (32-bit). Does 64-bit change the file format?
Also can x86_64 machines boot unmodified 32-bit OSes?
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NTFS is the same for 32- and 64-bit, so you will be able to read any files.
As for the structure -
The registry in 64-bit versions of Windows is divided into 32-bit and 64-bit keys. Many of the 32-bit keys have the same names as their 64-bit counterparts, and vice versa. KB article
so, your offline editor shall be capable of viewing/changing both parts.