2 computers to 1 modem?

i have 2 computers connected to 1 cable modem, 1 PC connected by USB and the 2nd by ethernet.

my question is, how can i share files on this computers?

is it possible to send any king of files from one pc to other?

if yes, how!?

thanks for help!

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You would need to fit a router to the LAN port, and both computers to the router to obtain networking.

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Does your setup for Internet sharing works well with both USB and Ethernet? If yes, well, it is the first time I see that. I don't know what is your modem model and if your ISP permit to have two different IP addresses. Anyway, the best and most secure method to share files between your two PCs and get at the same time Internet on both, is to share with a router. There is some inexpensive wired-only routers in many stores. Follow routers instructions and you should be in business to share Internet. Thereafter, for files sharing, that's more a Windows story! You will get your two PCs on the same network so to be able to share files, setup basic files sharing in Windows.
Just get a crossover cable, connect it to both pcs, manually set them ips 192.168.0.1/2 and the same subnets e.g. 255.255.255.0 and then enable file sharing, and put them both on the same domain. No need to buy a router. Ask more questions if needed :)