installation of cab file

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WinMobile5

WinMobile

I have an application running on windows mobile 5. I need to update the installed application by copying some additional files into the installation directory. Earlier I used to reinstall the whole updated application using the cabfile but now I just want to update the application by just copying the additional files using the updated cab file. How should i do that?

I created the cab file which included just the updated files and tried installing it in the device but it asked to remove the previously installed application before installing the new one and by doing so it removes all the earlier files and copies only the updated files.

Please suggest me some method to update the application. I need to do this as a version change.