Executing a binary (.exe) file on a client machine through a PHP page raises significant security concerns and is generally not feasible. ActiveX and Java applets, which could potentially run binaries, are limited by security protocols that prevent arbitrary execution of executable files. The discussion highlights the risks associated with allowing such functionality, including the potential for viruses and spyware. Alternatives suggested include allowing users to manually launch applications like "scan.exe" or using a simple upload form for scanned files, which avoids the complications of executing remote programs. The conversation also touches on the broader implications of developing a web-based accounting system using PHP and JavaScript, questioning whether this approach is effective compared to client-side applications that could utilize technologies like ADO.NET for better interaction with databases. Overall, the consensus leans towards prioritizing user security and simplicity in application design.