How do I get my Minecraft data from pc to Mac?

Many years ago, I played Minecraft on a pc. Now I was wondering if there was a way to get all my single player worlds from that pc onto my MacBook Air. I no longer have the pc, but I have a file named minecraft.exe on a flashdrive, which I think I used to get my data onto a different pc, which I also don't have anymore. Is there a way to use this to get my data onto my MacBook?

Unfortunately not, Minecraft saves are not stored in the .exe file, it is stored on your C drive (under appdata) if you don't have access to the PC then you won't have access to those files.