“DownloadCheck is an application that checks for applications in your Downloads folder. It was written in response to the MP3Concept Trojan horse release of April 2004,’ The IconFactory writes.
“It’s likely that you’ll never find a MP3 or other document type masquerading as an application. Most transport mechanisms on the Internet will not preserve the resource fork of the file being downloaded. Without the resource fork, the MP3Concept Trojan, and others like it, will not work. DownloadCheck is released as a deterrent for anyone who might consider writing an exploit of this type. We hope that we’ll never need to use it,” The IconFactory writes.
DownloadCheck is free and requires Mac OS X 10.3 or higher. More information and download link (404 kb) here.