Adobe Flash Player 12 Activex

The "ActiveX" version was one of several "flavors" of the player, specifically designed for Microsoft's ecosystem:

refers to a specific version of the Adobe Flash runtime environment specifically designed for Internet Explorer and other Windows applications that utilize Microsoft’s ActiveX framework. While groundbreaking at its release, this software has now reached its End-of-Life (EOL) and is considered a significant security risk for modern systems. What is Adobe Flash Player 12 ActiveX? adobe flash player 12 activex

The version number “12” wasn’t arbitrary. It marked Adobe’s aggressive push into hardware acceleration. Flash Player 12 ActiveX introduced: The "ActiveX" version was one of several "flavors"