This error is triggered because some previous un-installation of WinBackup did not completely remove all the references from the windows registry.
Please, follow these steps:
1. Uninstall your current WinBackup
2. Manually remove the following references from the registry:
Delete the w2bfile key at HKEY_CLASSES_ROOT\w2bfile\shell\open\command
Delete the w2bfile key at HKEY_LOCAL_MACHINE\SOFTWARE\Classes\w2bfile\shell\open\command
3. Install WinBackup 2.3
Important note regarding registry modifications Uniblue does not recommend
manually editing the Windows registry unless you are already familiar with the
Windows registry editor. Proceed with caution, and only if you feel confident
about making changes to the registry. Incorrectly modifying the Windows
registry can result in serious Windows or application performance issues.
UniBlue Technical Support cannot be responsible for problems caused by
modifications made to the Windows registry.