Android :: Android How To Read A File Provided By A Different Application

I need some mechanism so that an Android application can read a file which is provided by a different Android application. I know that it's possible if both applications have the same userid, but it's not feasible because it would require to sign both applications with the same key. The idea is that one application has a zip file which is uncompressed; the uncompressed files must be available to a different Android application. By default, it's not possible because that directory is not readable by the latter application. Is there any directory which can be readable/writable by both applications without hacks? Is there any other mechanism suggested by Android?