Kann Raw Photos nicht mehr öffnen

What has been changed on your system before the eror occurs?

Try to reset the preferences of Photoshop using the steps described here:

https://helpx.adobe.com/photoshop/using/preferences.html#reset-preferences

It's recommended to backup your settings before resetting the preferences.

See here:  https://helpx.adobe.com/photoshop/using/preferences.html#backup-photoshop-preferences

Reset also the Camera RAW preferences

If this doesn't help I would do a reinstall of Photoshop via the Creative Cloud Client.

During the deinstallation you'll be asking if you'll keep the preferences for later use I would say no. 

Then reinstall Photoshop and see if it's help.

Is your system up-to-date? Do you have installed all recent updates and patches for the operating system and the device drivers, especially the graphic driver. If you have a NVidia graphic card installed, make sure that you are using the recent Studio version of the driver, not the Game Ready version.

Unfortunately, nothing has changed. Should I make the new update in Photoshop & then make this setting again?

Thanks, that rules out any compatibility issues with the camera and ACR.

In Photoshop can you go to Preferences > Camera Raw > Performance and under Use Graphics Processor, if it is set to 'Auto', set it to 'Custom' and then uncheck 'Use GPU for Open and Save'. Click OK and try opening a raw file.

Dave

Adobe Camera Raw is version 17.1 i have the Canon G7X. 

What exact version of Adobe Camera Raw do you have installed and what exact camera generated the raw files?

Dave