I need to view a configuration saved in a .backup file
It is not a running configuration and i can’t restore it into a running device as it would break connections.
I’ve stored this file in a windows machine : can i read its content some way ??
Long answer: Almost. ‘strings’ will reveal some info from a .backup file but it looks more like status than config, to me [for example, can’t see any IPv6 addresses in it]. If you google, you will find a method [mtpass] involving OpenWRT that looks like a proper ball-ache.
Actually, it occurs to me that your question might be something other than what I’ve assumed it is, to which my answer would be, boot a virtual RouterOS instance [eg, CHR] and restore the config into that.