Windows shared folder access from a domain user to a non-domain user

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http://serverfault.com – I have two computer, the first one is the server (so WinXP) with a shared folder granted for user "test" and this is out of domain, it is just in WORKGROUP. The second computer is a client computer (WS2012) in domain and i would like to access directly to the shared folder of the server without prompting username/password. I tried to add a "test" user (with the same password) in localuser of the client and also in the domain, but the access fails. I need this on.the.fly access because i need some file from share just with a file path (ex. \server\path\file.txt) without prompting. thank you. (HowTos)