Highlights Puzzlemania is a game released in 1997. It is based on the children's magazine of the same name.
P000.DXR is a test file. Since all of the puzzle filenames consist of P followed by a number, its filename can be interpreted as "Puzzle 0". It contains the following contents:
A graphic with a simple background and text that says "Click anywhere to continue".
Three variations of an instructions screen that says "Missing Puzzle" and "This puzzle has not been complete yet."
An audio file with the internal name "Instructions" has a guy verbalizing the text on the instructions screen.