It looks like another developer has managed to sneak a tethering app into the App Store. QuasiDisk is billed as a file management app, designed to allow users to quickly and easily transfer files to and from their iOS devices. Hidden in QuasiDisk, though, is the ability to tether a computer to your iPhone via a proxy. Though the setup is a little complicated, it allows you to share your iPhone’s 3G data connection with your computer.

QuasiDisk is hardly the first tethering app to sneak past Apple’s notoriously finicky App Store approval process, and it certainly isn’t the last. It isn’t even the most blatant – that title probably belongs to iTether, which was launched then pulled in the space of a day late last year. Of course, neither Apple nor the carriers are ever happy about this sort of thing, so don’t expect QuasiDisk to be around for long. For the moment, though, it’s available in the App Store for $1.99 (iTunes Link). If you do manage to pick up a copy before it gets yanked, YouTube user Apoc269 has put together a video showing how to use the tethering feature.

It’s not clear how well the app actually works for transferring files. Not well, if the handful of reviews currently up in the App Store are to be believed. The interface is bare bones to say the least, and it’s a fair bet that the supposed file transfer functionality is just a smokescreen to sneak tethering back into the App Store. If you’ve got it, let us know what you think of it in the comments.