Opening a SQL File Does Not Open PGAdmin

Hello,

I'm trying to help someone who is running PGAdmin 1.16 on Windows 7, SP1. It's not urgent at all. When he opens up any .sql file, this is what he gets:

On other computers, opening a .sql file doesn't open this window, it opens PGAdmin. Even after he clicks okay from this message, PGadmin does not open. I checked the file associations, and .sql is set to open with "C:/Program Files/PostgreSQL/9.2/bin/postgres.exe", which I assume is right as this is what the PGAdmin shortcut points to.