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CDisplay or any other .cbr reader. They usually have a function that let's it view zip files or whatever you've downloaded.

Frakly CDisplay is ancient, the last release was in 2004. (More than 10 years ago!)

I recommend using something more recent like CDisplay Ex or ComicRack.

EDIT: "CDisplayEx's installer comes bundled with malware or adware. As always, be careful when installing, never choose "default install," and always read what you're installing before you install it to make sure you're not getting bloatware or adware on your system along with the app you want." - source

Just because CDisplay is old doesn't mean it would be bad. I still use it myself because it's pretty much the only reader that I think does the fullscreen experience right, and it comes with sane defaults and has very good controls.

Also, CDisplayEx has basically nothing to do with the real CDisplay. It's literally a completely different program, the author simply named it "CDisplayEx" because he wanted to leech on the fame of real thing.