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Most resumes are in MS Word format, followed by Rich Text, Plain text and PDF.
DOC Files (MS Word)Microsoft Word Files.
By far, the most popular format for CVs.
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RTF Files (Rich Text)The second most popular format for CVs.
TXT Files (Plain Text)A lot of CVs can be found in plain text.  
PDF Files (Adobe Acrobat)More and more popular for executive and professional CVs.  
  XLS FilesYou might find someone in an MS Excel database.