I'm trying to import a new LCIA method into openLCA, and the file format in the downloaded package is .xlsm, however, I do not know how to import it.
Do you have any information to solve this question?
I guess this file format can contain anything text based: https://filext.com/file-extension/XMLS:
XMLS files mostly belong to Microsoft Excel 2003 by Microsoft Corporation. File extension XMLS is a data format used by Microsoft Excel to save files which contain XML data.
Maybe open it in excel 2003 and then extract the content.