The file, yes, but not the file contents. Worst of all, if you opened the file recently with any process, there is a pretty good chance that the file-descriptor

The file, yes, but not the file contents. Worst of all, if you opened the file recently with any process, there is a pretty good chance that the file-descriptor can be found in: /proc/ somewhere. And with that in mind you can use a combination of lsof, grep, sed or any other tool to still read the file as it was.