That sounds like getting rid of the symptom while leaving the cause.
All SHARE.EXE does is to prevent two processes from trying to update a
file at the same time, or from reading while another process updates it.
If that happens, and you only boot without SHARE.EXE to get rid of the
error message, that sounds like a recipe for disaster later.
If REBUILD doesn't work with SHARE installed, it sounds like a
programming mistake that should be fixed. I won't try it unless I have
to, because of the side effects.
Yngvar