How do I restore Files that quicken can not open after clicking on View the use larger fonts

Question

HELP!!!! I was working on a very large 2019 budget file when I decided I wanted larger fonts.  I clicked on View, then on use large fonts.  The program change to only 2 tabs, "File and Help", with an error message that says it is unable to open the selected file.  I tried to open a 2018 file and also got "Unable to open selected file".  I then uninstalled Quicken and then reinstalled it.  It would open my 2017 file, but not my 2018 or 2019 files.  I have tried to super validate the files and they still will not open.  Fortunately I have the 2018 files backed up.  Alas, I have been updating the 2019 files for 6 hours today and did not close out or back up before trying to view/use large fonts.  I have lost all my work and can only backup to several weeks ago.  I have been on the chat line to no avail.  Does anyone else have this problem or have a solution?

Sherlock · Accepted Answer

Did you reboot Windows?  
Have you checked the disk and system memory?  
Do you maintain you data files in a local folder on an internal drive not accessed by other processes while the data file is in use by Quicken?
If you haven't already, you may want to review: https://community.quicken.com/discussion/7857675/faq-windows-defender-controlled-folder-access