I receive the following error message when importing a catalog to my account:

Catalog upload failed!: The file name should have '.cif','.xml','.xls' or'.zip' extensions.

Your file name uses an unsupported extension, such as a Microsoft Excel file with an extension of XLSX.

Use only the following file name extensions when uploading a catalog:

• CIF
• XML
• XLS
• ZIP

SAP Business Network for Procurement & Supply Chain > Catalogs > Catalog Publishing
SAP Business Network for Procurement & Supply Chain > Catalogs > CIF Catalog Error
SAP Business Network for Procurement & Supply Chain > Catalogs > Error in Catalog