The keyword is a specific relic from the golden era of file-sharing and niche software modification. If you were browsing tech forums in the late 2000s or early 2010s, you likely recognize these terms as part of a culture dedicated to "portable" applications and rapid data exchange.
: The "1 portable" suffix suggests it was the first version of a standalone executable that required no system registry changes. Security Note roughman injection rapidshare 1 portable