[SOLVED] Translating %-introduced hex characters into ASCII

I want to extract information from files that render a lot
of non-alphanumeric characters in hex, for example '%3D' for
'=', '%2B' for '+'. Is there a name for this practice? Is
there already a program that translates them into ASCII, which
would save me the trouble of writing one? Here's a sample line:

Quote:

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