I also heard dat we can not register a prop. firm but i have found below mentioned link where u find a word file and ca contact number. just check and confirm whether we can register the same or not.
PROPRITORSHIP FIRM REGISTARTION
PROP. FIRM REGISTRATION
REQUIREMENTS OF A FIRM
KNOW ABOUT PROPRITORSHIP FIRM
When the business is owned and controlled exclusively by a single person. it is called
sole-proprietorship, It is started through the initiative of the proprietor and is run
with the capital provided by him or through borrowed funds. The proprietor manages
the business himself, bears all the risk alone and gets all the profits. In this type of
firm, the proprietor can apply for the pan card in his name or in the name of the
firm. There is no restriction on the name of the pan card. He is free to choose
any line of business and take any action with the some legal formalities,
as applicable.