Libre Office just crashed on me, and the 60 megabyte .doc file I was working on is now a 3 kilobyte file (and corrupted). The backup in AppDate-Roaming-LibreOffice-4-user-bak is a 119 kilobyte file, also corrupted. Windows 10 does not have any previous versions. Is there anything I can do to recover it?
LibreOffice might have left a temporary file in the folder defined in Tools > Options > LibreOffice > Paths. In that folder, look for a folder beginning with lu and ending with .tmp that is dated around the time of the crash, e.g. lu2692q4sg9.tmp.
Inside that folder, find the largest file and copy it to your documents folder. Open LibreOffice, click the Open file icon, navigate to Documents and select the copied file, click Open. If it opens, great,save it with a different name as [new name].odt
For me, a 60 MB .doc file is a disaster waiting to happen. Nothing can be recovered from it with a small crash, even .docx can have parts recovered but not .doc. Always work in native format, that is .odt. If somebody needs it in another format, click File > Save a copy and send them that saved copy but do not work on it as the export has already lost styles and other applied formatting.
For the future, you might care to look over Preventing data disaster - The Document Foundation Wiki
I found copies of other files there, but unfortunately not the one I need.
I will certainly be more careful from now on, but frankly I did not expect that a crash would kill both the original file and the copy that’s in LibreOffice’s backup folder.