Summary
Follow these steps use a remote computer's internet connection. Host A will use Host B's internet such that it appears the connection originates from Host B.
Steps
Choose a desired file system. In this example we'll use S3.

Host A
- Run the following command to forward port 5000 to the remote PC.
ft.exe -w p:\1.dat -r p:\2.dat -L 5000:127.0.0.1:1080 --s3- Configure Windows to use a SOCKS proxy:

Host B
Run a SOCKS proxy.
- If using Linux:
ssh -D 1080 user@127.0.0.1 - If using Windows: Download simple-proxy and run:
simple-proxy.exe -bind 127.0.0.1 -port 1080
Start the file tunnel
ft.exe -r p:\1.dat -w p:\2.dat --s3
The tunnel should be online

Now run a browser on Host A and it will use Host B's internet connection.