>The message i get says that my document was edited with a pre-released version. I believe that this is a file that can only be opened with a particular version of indesign 2.0
Yes, it can only be opened with another, special pre-release version of InDesign. File formats often change during development, so documents must be migrated sometimes from release to release. Members of the official beta program had access to that pre-release version to do that conversion.