Powerscript to move files

Hi Guys,

I've got a list of files that I need to move (about 2 million) of those files I have wav and xml files I'm looking for a script to take that list of files and do the following

For each .wav file in list > Move to new location and rename

Names are 15 character number string and need to replace dynamically rename example:

echo F | xcopy Z:\recordings\890001\001\17\92\890001001179247.wav Z:\recordings_2012\890002\001\17\92\890002001179247.wav

Basically files need to go from 890001 directory with filename beginning 89001 to 890002 directory with filename beginning 890002

For each .xml file in list > Move to new location and rename as above also search and replace with regex in file

Example

Look for 890001001159100.wav

and replace with 890002001159100.wav

I could do this in a combination of batch files and notepad++ but if there was a powershell script I could feed data too with a couple of Regular Expressions that would be awesome