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Troubleshoot reasons that RAW images can't be opened on a computer
Confirming the software version
Open the version of Digital Photo Professional installed on the computer.
Select
Help
-> About
The camera is not recognized by the computer (Windows 7) (EOS Utility Ver.3.x)
1. Change the USB port that is connected with the camera
If multiple USB ports are available on the computer, switching the cable to another port may
help
the camera to be recognized correctly.
2. Use [Device Manager]