Software Deployment

If you are looking for MSI to copy the file and not any other solution :

You can either have a new MSI package with version equals to minor version increment of your existing MSI (this should upgrade your existing package)
OR
Update the existing MSI itself with newer file and use repair from source.

You can also do that using install files option in wise script.

Forget WiseScript, you can do this natively in the MSI.

XML files don't have version information so ignore that, too. I wouldn't rely on the file's date/time stamp, either, since a user could update it, meaning that the test in the package for a date older than the package's copy would fail.

Use the RemoveFile table to delete the old file. The table is documented in MSI.CHM which will have been installed with your packaging tool.

Is that all you are doing is replacing a file? Most app management suites will let you drop down files, if that is the case.

Actually i want to replace the sylink.xml file in remote computer in with SEP is installed. For that first i need to stop the SMC service and replace the file and after that SMC service will start.
I need a vbscript for this action. Can anyone help.

I need a vbscript for this actionNo, you don't. Use the ServiceControl table to stop the service. As with all the other tables, it's documented in MSI.CHM.