You mention that a file is corrupted. How do you know it is corrupted?
Do you get error messages
Have you tried opening your file with "Audit" selected
What has this to do with collaborate?
When you expect a file is corrupt, make sure that you have possible backup/backup files secured.
Do you have backup Revit files (ending in .0001.rvt, .0002.rvt etc)?
If you have you can check if you can open those.
You also might want to consider to upload your file here (max 75 Mb), otherwise use a service like wetransfer/dropbox, so that we can have look.
if you are convinced that your file is corrupted and you do not have backups anymore you really have a problem because not much can be done.
Your final resort would be (if you are on subscription) to create a support case in your account and see if Autodesk can assist you.
Louis

Please mention Revit version, especially when uploading Revit files.