Recover file after system reboot

[builder4580]

Recover file after system reboot
System: windows 10
AOO ver: AOO415m1(Build:9789) - Rev. 1817496
using Aoo Calc

My screen froze while I had several tabs open including an open office calc file.
I rebooted my system and when I tried to reopen my calc file the only thing that appeared on my screen was an ASCII filter option panel as below:
ASCII filter options
properties
Character set Western Europe Windows-125 OK
default fonts Times New Roman Cancel
language English (USA) Help
paragraph break CR&LF CR LF

When I clicked OK, all that was displayed was a large box (letter page sized) filled with rows of '#''s'. How can I recover my original file if possible?

[RoryOF]

Look at this Tutorial for help
[Tutorial] How to find and un-delete AOO temporary files

The file open at the time of the computer restart will be damaged, with no usaable content. Your only hope is to undelete a temporary file, which the above tutorial will help you with.