I have Admin access, but whenever any of the lookup files is opened through Lookup Editor, it gives me a warning message saying that "The requested lookup file does not exist". But when I open the lookup through a search query, I am able to get the details present in the lookup. Below search query is used.
|inputlookup append=t LookupName.
Lookup has Read permission to everyone and there is no write permission mentioned for any of the users. Also, even if I give write permission to Admin Role, I am still unable to open the lookup through Lookup Editor App.