We have found one software suitable in our database for this conversion.
It should be possible to convert iCalendar data (.ics) to Microsoft Excel spreadsheet (.xls, .xlsx), but for this you will need some specialized converter, such as ICS Fle Converter.
Also keep in mind that most email and personal management nowadays can import .ics files and at the same time export data in .csv format. Once you have the .csv file, you can import it to any spreadsheet editor and save in Excel format thus achieving ics to xlsx conversion without the use of 3rd party utility.
ICS
Files with ics extension are calendar data in exchange format which is widely accepted in many personal information managers and e-mail clients such as Microsoft Outlook, or Apple iCal. It is an universal format for transporting calendar data and events from one program to another.
XLSX
Files with xlsx extension are s used by Microsoft Excel for its workbooks (spreadsheets) in Office Open XML format. XLSX is the latest spreadsheet format used by Excel with the adoption of XML formatting first used in Office 2007. While older xls files were in proprietary binary file format, xlsx spreadsheets use a somewhat altered XML scheme.