An InfoPath form template is actually a CAB File containing different component files. Below is a list of files which forms part of an InfoPath template. .xsf file: A manifest file that describes the basic definition of other form files. .xsl file: Defines the transformation for data into different views. .xsd file: Defines the data source schema. .dll file: Carries the custom logic built into .NET or COM. .htm and other resource files: Custom HTML resource files and other resources for the form.