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First, your SQL statement has some errors in it, namely in that you don't qualify the title column as belonging to the course table. This query is also a very inefficient way to get the information your after. A better, more efficient query...

Googling 'Guest 501 4D' yielded a link to the forum of InsidePro. As far as I understood you should use SamInside (or something like that) to decrypt that. (And yeah, it uses bruteforce. There...

"Generic data file created by a specific application; typically accessed only by the application that created the file; may contain data in text or binary format; text-based DAT files can be viewed in a text editor." - Windows...

It's a url-encoded string with some fancy Unicode characters. Cleaning it with the following command... tr -d '\n ' | ruby1.9.1 -pe '$_.gsub!(/%(..)/) { $1.to_i(16).chr }.force_encoding("utf-8") .gsub!(/[^\u0000-\u02ff]/,"")'...

I'm having a bit of trouble following your code but here's an alternative solution you could consider. I got bored one day after class and decided to make a C++ calculator. I've extracted the relevant parts of...