Adobe Plug-in Files Extensions - What are adobeplug-in files and how do I open a adobeplug-in file?

What are adobeplug-in files and how do I open a adobeplug-in file?

File Type Category File Format
.8ba Adobe Plug-in Files Photoshop Plug-in
.8bf Adobe Plug-in Files Filter Factory Image Filter
.8bi Adobe Plug-in Files Photoshop Plug-in