Saved on floppy disk 😂 someone smarter than me

Hi guys, I am trying the strength of community the. Back in 2017 I earned some $DOGE coins. It was less than 1 ¢ in that time. I thought I deleted my wallet because it remained down for very long time. Now I found the wallet backup. Perhaps, I am not able load it into Doge Qt neither Multidoge. I tried even older versions. It was so low that I didn't use any password. I know it for sure.

The file looks like that. It is big ~ 40 kB. Does anybody have idea how to open it, please ?