There exists a variety of tools doing the repairs or data extraction from a given file type, like DOC/DOCx, ZIP and so on. The file recovery is actually one more recovery type, similar to photo recovery which was mentioned earlier.
The file recovery software may be useful if the file got damaged because the file data was not fully written to a drive, say, because of the power failure during the write. Or because the program working with the file crashed before completing the write. Should this happen, the actual file content (or a worthwhile part of it) might still be written to the file.
Practically, it is pointless to apply such software to "fix" files which data recovery software found on the damaged drive. The data recovery process, such as the one used to recover RAW file system, typically either gets OK files, or the files are fully damaged, not containing any trace of original data. If the files do not open in their respective programs after a data recovery, this means most certainly no subsequent fixing applied to these files can restore them because the useful data is just not there.
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