Adobe Shockwave Player was a popular software used for playing multimedia content, such as interactive games, animations, and presentations, on the web. The file you've mentioned appears to be a compressed archive (RAR file) containing the installer for Adobe Shockwave Player version 8.5.
: By 2001, over 200 million people had the Shockwave Player installed, making it the dominant format for heavy-duty browser games on sites like Miniclip and Shockwave.com. Adobe Shockwave Player 8.5.rarl