I'll echo Adrien's comments regarding your use of a backup. 

On the reported problem, I'll note that your book file appears to be on a cloud 
drive ("OneDrive") and perhaps your connection to the cloud has been 
interrupted? You could test this by copying the data file to a known local 
folder on your hard drive...

⁣David T.​

On Jan 26, 2024, 10:36 AM, at 10:36 AM, Adrien Monteleone 
<adrien.montele...@lusfiber.net> wrote:
>That message is usually indicating you have the file saved in a
>database 
>format rather than the default XML, and you don't have the proper 
>database drivers installed. If you recently tried to save your file in 
>one of those formats, this could be the cause. If not, then someone
>else 
>might have some ideas. (I personally don't regularly use Windows and 
>even then, not with GnuCash, sorry.)
>
>Additionally, your error message shows the filename of your book you
>are 
>trying to open, and that reflects you are trying to open a backup of a 
>book called "send".
>
>How did you start GnuCash? Did you launch the app from an application 
>shortcut, or did you attempt to double-click the file you wanted to
>open?
>
>If the latter, try just launching GnuCash by itself, as it will always 
>open the last used file. (assuming that is the file you want)
>
>You may have also just accidentally double-clicked on the wrong file. 
>But if that is your book, or you think it is, and it is the one you've 
>been working in, then you might have a problem in that it is a backup, 
>not the original file. Double check that its last modified date is 
>1/24/2016 at 5:09pm. If the modified time is more recent, then you've 
>been working in that backup file. The numbers in that file name
>indicate 
>it was created as a backup on 1/24/2016 at 17:09:05 and the original 
>file was named 'send'.
>
>The problem with working in a backup file is that if you *also* were 
>sometimes working in the original file, the two have now diverged and
>do 
>not contain the same transactions. If you've ever notice that it seemed
>
>transactions you thought you entered were missing, that would be a sign
>
>you were working in two different files each time. If that turns out to
>
>be the case (I hope not!) it can be resolved, but will take some time 
>and tedious work depending on how much divergence there is between the 
>two files.
>
>Regards,
>Adrien
>
>On 1/21/24 9:18 AM, pwen...@gmail.com wrote:
>> Received message "No suitable backend was found for {file
>> path\filename.gnucash}.  Have been using Gnucash and this file for
>years.
>> Suddenly, I get the no suitable backend message, and I am not able to
>open
>> the file.  Would really appreciate any guidance to restore this file!
> Thx!
>
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