Go to the Start menu, P rograms, DOS prompt. This is a fairly intuitive program. On the left side will be the PC directories. On the right will be your gwis2 directories.
Maple worksheets can go either way.
To upload your file, go to its directory on the left and your target directory in gwis2 on the right. The file should upload in a few seconds. Don't forget to add links to them in your web page. You do this from the math department computers where ghostview is already installed.