A number of users are telling us that the file they download has the extension  .PHP.  They also tell us that their browser can't find an associated program, or wants to run some other program such as "Broderbunds Greeting Cards Program".

On the download page, in italics, is the explanation for this:

Note to Mozilla/Netscape users: Some versions of your browser may append the extension .php to your downloads. For example, myfile.zip may save as myfile.zip.php. You should remove the extra .php extension.

So the advice is: Remove any PHP file extension and you should be OK.