How Docker manages system calls from apps that are not based on Linux

I've been researching the Docker for a while. However, i couldn't come up with a satisfying answer to a question that title suggests.

For instance, assume that i have an application that is built on my Windows machine. So, Windows has unique and distinct system calls. Thus, i wonder that when i dockerize my app, if it produce system-calls throughout the period of running in Docker Container, how system calls are managed? When my application requests "ReadFile()" does the Docker convert this system call to Linux call?