File formats PowerPoint can import as charts

Microsoft Office PowerPoint 2003

You can import data from text files and other programs in the following formats.

.txt, .csv
Delimited text (text separated by tab characters, commas, or spaces)
.wks, .wk1
Lotus 1-2-3
.xls
Microsoft Excel worksheet or workbook
.xlw
Microsoft Excel version 5.0 workbook
.xlc
Microsoft Excel version 4.0 or earlier chart