did someone email you a hfs file and you're not sure how to open it? maybe you have found a hfs file on your computer and wondering what it's for? windows might tell you that you can't open it, or in the worst case, you might encounter a hfs file related error message.

How would the previous sentence be correctly capitalized?
Did someone email you a HFS file and you're not sure how to open it? Maybe you have found a HFS file on your computer and wondering what it's for? Windows might tell you that you can't open it, or in the worst case, you might encounter a HFS file related error message.