I don't know if Easy CD & DVD [the version that's Win 8 compatible] will open them or not. Someone with that product would have to check it like I did below. If not, the only other possibility would be to go with one of the NXT suites if that has the option. Again someone would need to verify that also as I don't have it loaded currently, only C2012, which is not Win 8 compatible.
In Creator 2012, from the Home screen under Data Disc [like Brendon eluded to], it shows that it would open .ROXIO project files [i don't have any to actually try and it will only save the projects with .rox extensions].
Keep in mind also, since they are 'project' files, they don't contain any of the files you added to the project. It only contains 'pointers' to the locations of the files you included in the project, so all of the files would still need to be located in the same exact path [ C:\users\..... or whatever ] as they originally were when you saved the projects in order for it to be able to load the project and burn it.
Creator 2012 screen examples
This comes up listing .ROXIO when clicking on the Projects button