copy and Rename a file

[sri]

Hi,
I am creating an installation file thru nightly build.After the file is created successfuly want to copy it to some location and rename it file.The installation file name changes often. For example the file name is like
acbinstall_4913_9.exe
It has to be renamed as abcinst51.exe
where 4913 are the build number with a sub version 9.
The numbers can be incremented at any time so whenever change is made in the build or subversion has to be copied and renamed automatically.

How can i achive the above?

Thanks
Sri