I have a large number of Lotus 1-2-3 spreadsheets to convert into Excel workbooks. After opening a Lotus 1-2-3 file, and saving as a .xlw file, the new .xlw file opens in Excel as multiple windows, corresponding to the number of tabs in the spreadsheet. For instance, if the spreadsheet has 17 tabs across the bottom, then it opens as 17 windows. They are named Spreadsheetname:1, Spreadsheetname:2, etc.

I understand that I can fix the problem by closing all but one of the windows in Excel and re-saving, but what I'm after is why this is happening, so I can prevent it in future conversions. Can anyone help?