transfer routes from apple macbook to windows laptop

Hi

Since I have got the new apple macbook pro with the apple M1 pro processor I cannot connect my sat nav to my new laptop for express and basecamp. I have requested help from garmin and am waiting a reply.

However to tide me over I bought a cheap windows laptop which will allow me to connect to both apps. However I have tried to do backup to a pen drive from my apple laptop in basecamp and restore in the windows laptop to move my routes over. 

Although the windows recognises the pen drive with the backup that I downloaded onto it from basecamp nothing gets "restored" in the other windows based laptop.

Can anyone tell me what I am doing wrong, thanks Graham