Access to system files

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http://androidforums.com – Hi I've made few changes in the build.prop file and now the phone is not rebooting. It stuck on the white screen with htc logo. The phone is rooted and I can access to recovery mode. I have backup of the original build.prop file. The problem is that I cannot access to the system folder in order to change the file back. When I connect the phone to the computer using the USB nothing happen. It doesn't recognize it. How can I access the system folder of the phone? (General)