I receive a message "Either the file does not exist, you do not have permission, or the file may be in use by another application." when I try to open a document. My guess is that I do not have the permissions to open the file. I dowloaded the Adobe Design and Web Premium CS6 trial version to be able to review a document by another user. What can you tell me to help me open the document and make the changes to the content?
Try copying it to another storage media, like an USB drive. If it works from there, ID can no access the original location due to user restrictions.