Any time you create a macro enabled spreadsheet using Microsoft Excel it will save as a xlsm file. If you did not create the xlsm file but would like to view it you will need to install a copy of Open Office Calc to your computer. You can also open xlsm files with Microsoft Excel but if you do not own a registered copy of Microsoft Excel you will need to buy a copy. Open Office Calc is a great alternative because it is free. You can also use Open Office Calc to edit, create, and save xlsm files.
Finding a copy of Open Office Calc should be fairly easy. The entire Open Office line of software is open source which makes it free for everyone to download and use. If you can not find a copy of Open Office Calc you may need to download and install the entire Open Office software package. You may found the other programs included with Open Office to be very useful for opening other types of file extensions.
Open Office Calc is the spreadsheet program included in the Open Office software line. If you have downloaded the whole package you will also receive a number of Open Office applications which can be used free of charge.