If you are unable to open the file, the file is saved according to the file system, as .doc, .docx or .xlsx. If it is a DOC file, you can copy the file manually to another software converter like Microsoft Word. If the file is a .DOC file, you can use Microsoft Word as a source format converter to convert the file to DOC, DOCX or XLSX. Read Microsoft Word conversion guide to help in converting a .DOCX file to DOC. Read how to convert .xlsx to XLSX file to Microsoft Word.