Auto Version update

We have a version for every file like RHZ 1.0 / Ver 1.4.2 etc.
Whenever I place a new file with same file name i want the version to get auto upgraded. So can anyone suggest code..

Eg:
RHX 1.0 -> RHZ 1.1
Ver 1.4.2. -> Ver 1.4.3

There are specialized software for this purpose, look at :
Concurrent Versions System - Wikipedia, the free encyclopedia
CVS - Open Source Version Control
Apache Subversion