In the first place, the i386 folder is a storage folder...has nothing to do with active O/S.
If any file is missing from the i386 folder, seems to me that any number of efforts could correct that. The most simple seems to be simply copying it from the active location and placing it there.
I don't know the source of your info...but I only show two locations (System32 folder and System32\Dllcache folder) for this file, with the i386 not being either.
I suppose that it could be part of the .cab file in i386, which makes sense to me. If it is, then it's compressed and you would have to restore the .cab file in entirety. I suppose that could be done by updating an SP or doing a repair install.