Welcome to the all-new Android Central Forums! - We're still moving some things around, so you may see a few quirks here and there, but we're working on getting things fully completed as soon as possible. For now, take a look around, and if you run into any major issues please let us know in this thread!
But they are to unzip zipped files not hqx filesJust search 7Zip in the Play Store. There are several.