Identifier Too Long

hi there, i have following code

SET QUOTED_IDENTIFIER ON
DECLARE @sTableDiff varchar(1000)
SET @sTableDiff= " ""C:Program FilesMicrosoft SQL Server90COM ablediff"" -sourceserver ""VSNET1"" -sourceuser ""sa"" -sourcepassword ""sa2345"" -sourcedatabase ""PMSTEMP"" -sourcetable ""DEMAT"" -destinationserver ""VSNET1"" -destinationuser ""sa"" -destinationpassword ""sa2345"" -destinationdatabase ""PMSRESTORE"" -destinationtable ""DEMAT"" -f ""c:Diff"""
PRINT @sTableDiff
EXEC XP_CMDSHELL @sTableDiff

When i execute it, throws error as


Msg 103, Level 15, State 4, Line 3
The identifier that starts with ' "C:Program FilesMicrosoft SQL Server90COM ablediff" -sourceserver "VSNET1" -sourceuser "sa" -sourcepassword "sysadm" -sour' is too long. Maximum length is 128.


When i split the Identifier as

SET QUOTED_IDENTIFIER ON
DECLARE @sFull varchar(1000)
DECLARE @s1 varchar(1000)
DECLARE @s2 varchar(1000)
DECLARE @s3 varchar(1000)
DECLARE @s4 varchar(1000)
SET @s1= '""C:Program FilesMicrosoft SQL Server90COM ablediff""'
SET @s2= ' -sourceserver "VSNET1" -sourceuser "sa" -sourcepassword "sysadm" -sourcedatabase "PMSTEMP" '
SET @s3=' -sourcetable "DEMAT" -destinationserver "VSNET1" -destinationuser "sa" -destinationpassword '
SET @s4=' "sysadm" -destinationdatabase "PMSRESTORE" -destinationtable "DEMAT" -f "c:Diff"'
SET @sFull = @s1 +@s2 + @s3 + @s4
EXEC XP_CMDSHELL @sFull

this executes fine but the optput is as

The input line is too long.
NULL

What is this?
how could i execute such long commad using CMDSHELL?

Regards,
Thansks.
Gurpreet S. Gill