Sometimes you need some batches for doing stuff like appending extension to existing files or removing extension from existing files
After googleing as I'm not good in CMD scripting I manged to write both renameToOld.bat and undo-renameToOld.bat batches
which rename all the files found in a specific folder to *.old and reverse operation by removing the .old extension from the files found in a specific folder.

for renameToOld.bat :
@ECHO OFF

REM
REM Remove the double quotes from the front and end of the root path
REM