Although I'm afraid you are out of luck without a backup, I'd like to ask you to post a list of files with sizes, and time stamps.
The first files you mentioned is most likely a descriptor file which points to a missing ...-flat.vmdk and the second file is a snapshot/data file for with the descriptor is missing. In addition to the file list, please attach the descriptor file to a reply post (use the advanced editor).
Do you know what happened, caused this issue? Did someone e.g. try to delete files from the datastore browser?
André
Message was edited by: Sorry, I was distracted when I wrote the reply. Please post a screenshot of the Datastore Browser Window showing the files with sizes and time stamps.