As joethomas asked, what type of file is it?
There are many files that standard carving programs will not find, eg .dat , .txt or ones for very specific applications
My approach would be to use a hex editor and do some manual searching. If the file type has a unique signature, then it may be easy to find (and some carving tools will allow you add the signature). Otherwise, try and find a string 'unique' to that file. If it is text, maybe a text string.
You do not say if you are after a single file, or several/many files of a specific type.
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