If you didn't shoose the name home.htm, change it. For instance, if you are in Explorer, you can right click and choose Rename. Recall that Windows often doesn't show extensions like .htm. If you saved your file as HTML and it has the appropriate icon (part of a wheel for Netscape, a blue 'e' for Internet Explorer) then it has the proper extension. You need only worry about the filename. It must be home.
Another thing about file names: Unix does not like file names with spaces in them, avoid using them in any file you intend to be a part of your web page. (Remember that if you change a file's name, you must also change any hyperlinks you made to it.)