I have a Freestyle Libre 2 blood sugar meter, and it uses a driver to upload results to the website. Unfortunately this driver is written in C++ and only compiled for Windows and Mac OS. I use Linux and have tried installing in a virtual machine and also using layers such as Wine. I think I am left with only one option, recompiling for Linux.
It is a USB driver for communicating with the reader, to gather and upload the data to their website.
Is there a way to extract C++ code from the .exe file and then recompile it to Linux after making any necessary changes to the code?
No. You cannot extract the original source code from a compiled binary. You can reverse engineer it, though.