The original poster asked if they could add more media formats to the Windows "Play To" feature, noting that MKV files do not play without conversion. The response explains that "Play To" compatibility depends on the receiving device, recommending converting unsupported formats like MKV to widely supported ones such as MP4, and suggests using third-party media servers or DLNA-certified devices for better compatibility. Overall, the discussion indicates that converting files is a practical solution to improve streaming support, highlighting the limitations of direct "Play To" functionality with certain formats.