Excel 1.5 for the Macintosh can read only those Excel PC files that are saved
in SYLK format. The default format for Excel PC is XLS. The Excel PC user
must save a document using the SYLK format before Macintosh Excel can read
it. Using AppleShare PC or AFE does not affect the data formats, nor should
they in this case. The use of different data formats was a decision made
by Microsoft.
However, this is not necessary for Excel 2.2. All versions of Excel now use
the same native ("BIFF") file format, and SYLK is not necessary. Users can
specify a date system to use 1900 or 1904 via the Calculations, Options dialog
box.