does it exist a protable version of infopath?

Hy,
I have to insert data in xml files. My company asks me to buy Infopath but I suppose there's a free alternative. When I'm at home I've just downloaded the extension for windows and I can use it on my pc. But when I'm around with my small netbook I just use everything in a portable edition and I don't have Office on it, I've Open office.
Do you know if one of the listed software can be used to work on a xml file?
Someone suggested me to use notepad++ but it opens the file as if I should modify it and it's visualized in a completely different way (I can't see the field to be filled...). I'm not a computer programmer, I'm just an employer.
Can you help me?
thanks
Kirian