Programaticly adding and edditing existing form on sharepoint

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C#

SharePoint

forms

InfoPath

Hello..
Im developing a webservice wich creates a new infopathform.xml(I edit the template.xml from the original form.xsn) and upload it to a sharepoint library, the webservice can also download existing filled out forms from library and edit them.
Our company need this for the users who dont have access to sharepoint site to remoatly add content to the forms library.

So what I want to do is to load the form.xsn from my c: drive, edit its xml programaticly and upload it to sharepoint, becouse Im having problems with the template.xml after its uploaded(I cant save it as an xml file only as form.htm)

So if anyone know how to tackle this problem in the best possible way please help.

Thank you for your answer!
B