All the mobile OS do not directly provide access to root files and other system files. For Android phones, you need to root the device to get access and similarly you need to unlock or jailbreak WP7 devices to get access. With WP Root tools, you get root-access to parts of your WP7 device. This version contains a registry-editor, a file-explorer with basic file-operations and a certificate-installer with write-access to the certificate-stores.

Warning: This tool is in alpha stage. That means that it is not feature complete and it is not yet properly tested. This tool also provides you with high privileges with which you can alter low level settings and data on this device.

More details on this tool available on XDA Forum post.