Excel

Navigator currently only supports .xls files and not .xlsx

Data can be in multiple worksheets.  Not all worksheets have to contain properly formatted data. You can later choose which ones to use.

A properly formatted worksheet should contain a single table of data.

The top row of a properly formatted worksheet should contain the names of the columns.  Columns must be left aligned, if there are 4 columns, columns A,B,C,D should have the data, without blank columns in between.

If column names are not unique, the columns will be given unique names (by appending 1,2) when the table is processed.

Multiple values can be placed in a single cell using a delimiter.  For instance if a column contains Authors, a cell can have the value "Vonnegut; Dickens; Twain".