Thank you for the response. The link you identified is very clear and explicit.
However, I think my question was not as precise as it should have been. The software file I downloaded is an executable ".exe" file with the title I first posted. I have not run the file as yet, and my AVG virus software flagged it as a "downloader ... " Trojan horse.
So my real question is: how can I determine if this a false positive or actually a Trojan horse? The website is rated safe by AVG, I have used it previously with no problems, and I did pay for the software, so it seems to me it may well be a false positive. But then again, I do not want to install a Trojan horse!