You can save existing .aws spreadsheets to Excel's XLS format in Ability Spreadsheet using the Save as.. function. It seems the format is not well supported in other spreadsheet programs, so this remains your only choice for aws to xls conversion.
Convert Ability Spreadsheet spredsheet file to Microsoft Excel 97 to 2003 workbook.
We found one software available in the database for this conversion.
Microsoft Windows software - convert aws to xls on Windows
A fully featured spreadsheet program from Ability Office software suite
Convert from aws file format
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.