Check your backup filename
Make sure there aren’t symbols, special characters, or spaces in your backup company filename or the folder holding it.
Open the Windows Start menu.
Type “File Explorer” into the search and open File Explorer.
Find and open the folder with your backup company file.
Right-click the file with .qbb at the end of the file name and select Rename. This is your backup company file (also known as a QBB file).
Remove any special characters, symbols, or spaces from the filename.
Right-click the folder holding the QBB file and select Rename. Remove any special characters, symbols, or spaces.
Follow the steps to restore your company file.
Create a portable company file
If you can't restore your QBB file, go back to and open the company file you created the backup from.
Follow the steps to make a portable company file (also known as a QBM).
Use the portable company file to restore your company file.