Issue to load file from path using SQL Server 2005

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I've done a .Net Web Service Client to send a file trough it and it works smoothly; but when I use that Application from a Store Procedure from SQL Server 2005 like this:exec master.dbo.xp_cmdshell 'C:\folder\myapp [email protected] Application "\192.168.1.200\folder\2012\12\file.xml"'I get this error:\[code\]Unhandled Exception: System.UnauthorizedAccessException: Access to the path '\\192.168.1.200\folder\2012\12\file.xml' is denied.at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath) at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy, Boolean useLongPath) NULL at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, FileOptions options) at System.IO.StreamReader..ctor(String path, Encoding encoding, Boolean detectEncodingFromByteOrderMarks, Int32 bufferSize) at System.IO.StreamReader..ctor(String path, Encoding encoding) at System.IO.File.InternalReadAllText(String path, Encoding encoding) at System.IO.File.ReadAllText(String path) at myapp.Program.Main(String[] args)\[/code\]