A common problem is that you receive a file in a format that you cannot easily read because you don't have an appropriate application. This is particularly irritating in the case of binary files that are intended to be read only by a particular application but that you know actually contain text and formatting instructions. The most common case of this problem is that you want to retrieve the text from a Microsoft Word file. But equally, you may want to extract the text from a file that has been sent to you in PostScript or PDF format; you can display the file beautifully on the screen, but it's not always obvious how to retrieve the text. The tools discussed in this section can help with this common problem.
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