We have a doc library that behaves like no other ones we have!
Site collection feature and library settings are both set to open the docs in the default browser.
However when a user with read only permissions tries to open an excel doc they get the error (in a web app window) that the workbook can not be opened.
When users with contribute rights click it, it opens in excel perfectly.
Thinking this may be a macro/formula thing I uploaded a new excel doc with nothing more than "hello" in A1.
Exactly the same issue.
Unable to open unless have at least contribute.
If I have flicked off "require check out before edit" (which shouldn't come into it but as a test) and no change.
Any ideas?