ECW - file format - was created in 1998.
Interchange File Format was created in 1985.
Zip - file format - was created in 1989.
Tagged Image File Format was created in 1993.
Exchangeable image file format was created in 1995.
Audio Interchange File Format was created on 1988-01-21.
Additive Manufacturing File Format was created on 2011-05-02.
ECW Press was created in 1974.
DAT is a generic file extension (usually short for DATA). Its format and content are determined by the application that created the file. Without knowing what file created the DAT file, it would be very difficult to deterime how (or even if it was possible) to convert to XLS format. See related links for more information about the DAT file extension.
ECW on TNN was created on 1999-08-27.
ECW Hardcore Revolution was created on 2000-01-31.
ECW Hardcore TV was created on 1993-04-05.
A document that is created by Microsoft Excel. Excel is a spreadsheet maker.