Batch file to change file extensions

[Joe4]

Barry was kind enough to help me write some Excel VBA script that will rename a text file with a ".prn" extension to a ".txt" extension ( http://www.mrexcel.com/board2/viewtopic.php?t=187679&highlight= ). This works great for new files being created, but I have to clean up a bunch of old files.

Can anyone help me write a Batch file (.bat) that I can run that will convert ALL existing "*.prn" extensions to "*.txt"?

The tricky part is that I need to do this without using the two step COPY then DELETE technique, as new "*.prn" files are being added all the time and I can't risk deleting one without changing it to a ".txt" (if one is being added while the batch file is running).

Thanks.

 

[Joe4]

Barrie came through again!

From Barrie:

This worked for me.

rename *.prn *.txt

Note that the batch file was in the directory containing the files. Let me know the results you get.