[dba-Tech] Wireless

I didn't know my new comp - a desktop - came with wireless.  Imagine my
surprise when, during the start up, it detected my network - usually I don't
connect a new machine to the internet until I've got AV and a firewall
loaded.
 
But I put cabled anyway to an open port on the router.  SO I've got two
connections - the wireless at 65 Mbps and the hard wire at 100.
 
Question is - does the OS pick the faster one?  Or how does it decide which
one to use?  And can you/need to force it to use the faster connection?
 
I'm transferring several gigabytes of stuff from old comp to new - so I'm
curious.
 
MTIA
 
Rocky