You can try restoring an earlier version if necessary. This procedure is covered in Windows 7 Help and Support under "Recover lost or deleted files" in the section "To restore a file or folder to a previous state". If you get a "didn't shut down properly" message just close it with the "X" at the right (or ignore it). Click OK to close the message, then close the Properties and Explorer windows."The folder has been successfully restored to the previous version." Windows should then copy a bunch of files to restore Chrome, finishing with.That should pop up a confirmation window ("Are you sure you want to restore."). Click to select the top (most recent) version, and then click "Restore.".Right-click on the "Chrome" folder, and then click "Restore previous versions" in the pop-up menu to open the Chrome Properties window.That should open an Explorer window with folders including "Chrome".Click Windows Start at left end of Task Bar, put the following in Search Box or Run, and press : %LOCALAPPDATA%\Google.
Close any Chrome windows that might be open.If you are very (I mean very) motivated, you could still save your corrupted file before overwriting it (maybe it's too late), then look at google chromium source code to learn things about the file format, and then try to extract as much information as you can from your damaged file.
Next time it may be your entire hard disk. But remember that you only lost one file. I'm sorry because this is probably not what you want to hear. This includes your mail directory, browser settings, cat pictures, etc. You should make backups of everything is important to you before this kind of things happens. It could also be an NMR Spectrometer operating too close to your computer (well, depending on where you work, but it happened to a friend of mine and I couldn't resist). It may come from a power failure during a write (even if you didn't notice it, you computer may not even rebooted), or a software bug in google chrome causing it to write garbage to its files. More seriously, many things can cause a file corruption.
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