uunable to open Passport

Is there a way to connect my WD Passport to Windows
It is format for a MacBook Air

Hello,

You can reformat the drive in the ExFAT file system which is supported by Windows and Mac OS in order to use the drive on windows or mac OS using the following link mentioned below:

https://support-en.wd.com/app/answers/detail/a_id/20821

Is the any way to do it without losing the information on the external harddrive?

This reads as if no backups do exist. One can be sure that one will eventually get bad luck if one ignores the rule of thumb to have almost always at least two verified backups ready for usage.