Help reading old QBooks

Hi. I have an old CD with tax prep on it from 5-7 years ago. My accountant can’t read it. Any suggestions?
PS I’m not good with software… Step by step instructions suitable for gramps appreciated.

Im replying a bit off-topic but your record is more than 5 years? Are you even legally required to keep records that long or is this more of a curiousity?

Also what is the file extension?

Legally I believe it’s 6 years in Canada. I haven’t filed in that many years either tho… I’m playing catch-up. I’ll see if I can get an extension.