Reover Notepad++ File With ‘nul’ (Power Cut)

I was editing a file in Notepad++ which I saved. Unfortunately I did not close Notepad++ application and there was a battery backup outage and my PC abruptly was powered down in an instant.

When the power was back on, I opened my file and found only ‘nul’ ‘nul’ ‘nul’ ‘nul’ ‘nul’ all over doc. However my file is of size 12kb. And the size of ‘nul’s added is to the same size as the previous length of the document.

I would really like some help here, as its a week’s work I’ve put in on this. I would like to recover this file.

I’m also attaching a link to the SCREENSHOT

Please help.