>>The problem with pdf files in your case however is that what you see as a "text" in pdf file may be not a text but a picture; and then you cannot use the pdf text extraction tool.
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>In this particular case I know that it is a text file or should I say a file with text.
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>Thank you. Alex

If it is a PDF file, then I would call it "PDF file containing text". And if it contain text, then you can use text selection tool from the acrobat menu (and use the SendKeys method as well) or any other pdf2text conversion tool.