OpenOffice 4 for Template

Anyone using Openoffice to edit template?  Any issues?  What should the file be saved as, .xls?  .xlsm is not an option in Openoffice.

Using any program but Microsoft excel will break the spead sheet in uperdicatble ways. No other otion untill cambium makes a none excel template to use.

They appear to have an ODS template now. Is anyone using OpenOffice now?