Some of the Quattro pro file formats are supported by Microsoft Excel. Here's a list - http://support.microsoft.com/kb/147643/EN-US/ Also on the page linked above you'll find a link to supplemental converters that may be of use.
Asked in Microsoft Excel
Can't open Excel xlsx files but can open xls files?
Excel 2007 creates xlsx files, and earlier versions of Excel create xls files. The earlier versions won't be able to open the 2007 files. So you need Excel 2007 to open them or get a converter or try and open them in Google docs. If you get them open, then save them in your version of Excel so that they can be opened in future, using the Save As option on the File menu. ...
Asked in File Formats
What file format are Google spreadsheets saved as?
Converting your files such as a spreadsheet to a Google document allows you to edit and share online. To convert a spreadsheet simply save as a .xls, .xlsx, .ods, .cvs, .tvs, .txt and .tab file. ...
Is there a way to change pdf files to ppt so that they are slides and not images?
Sure, what you need is an 3rd party tool like PDF Converter or else which could convert your PDF to other format like word, ppt, xls, or epub something. ...