First you need to know which file in your WindowsImageBackup folder you need, so look for the largest .vhdx file.
You can right click the file and select mount. It will show an error, but don't worry. Open Disk Management and the partition should be listed as a separate drive, but you need to add a drive letter to access.
If you start from Disk Management, use the tools menu to Attach VHD and browse for the file. Again you will need to add a drive letter to it. Make sure and Detach it using Disk Management when you are done.