I have an Excel spreadsheet that was saved with the .xls extension. However,
when I open it, instead of the text that was typed into the spreadsheet, it
now shows html language. Example:

HTML {BACKGROUND-IMAGE: url('Images/spacer3.jpg'); MARGIN: 0px; LINE-HEIGHT:
125%; BACKGROUND-REPEAT: repeat-y; FONT-FAMILY: "Gill Sans", "Gill Sans MT",
"Trebuchet MS", Geneva, Verdana, Arial, Helvetica, sans-serif

Can you tell me what happened? How do I get the original text back?