If you do not have an app installed that can open and
resave .cr2 files......the freeware IrfanView may be worth
a try:
(FWIW...it's always a good idea to create a System
Restore point before installing software or updates)
IrfanView and IrfanView Plug-ins
http://www.download.hr/download-irfanview.html
(scroll down slightly for the download links)
(get the plug-ins too)
Once IrfanView and the plug-ins are downloaded and
installed...open it and go to...
(FWIW...this task is easier to do than it is to explain)
File / Batch Conversion-Rename
On the Batch conversion screen...Tick...Batch Conversion...
At...Output format...choose...'JPG - JPG/JPEG Format'...
At...Output directory...choose the folder you wish to save
the JPG files in...(If you want the converted files in the
current folder...just left click the "Use current ['look in']
directory")
In the "Look In" field...browse to the folder your .CR2
files are saved in...When the CR2 files appear in the
upper field...left click the 'Add All' button...
When the CR2 photos appear in the lower field...left
click the...Start Batch button...
When the conversion is complete...left click the 'Exit
Batch' button.
Close IrfanView and you're done...