An InfoPath template have an extension of .XSN which is simply a .CAB file. If you extract it, you will see a set of files. Basically there will be:

manifest.xsf
myschema.xsd
sampledata.xml
template.xml and
view1.xsl

 
I found a non-straight forward way to create the files if you have some fixed form structure. Here are the actions [...]