The hiebook eBook Reader was an eReader that was released in 1999-2001 and manufactured by a Korean company. Its native ebook file format was KML (.kml), based on HTML text.
At the time of its release, it was a fairly advanced device for the time. It could play MP3 files, was navigated with a stylus-controlled touch screen as well as buttons on the side of the device, and it could display images as well as document files.
This device came with Librarian software that was used to manage ebooks and other files between the computer and device. It is compatible with Windows 98 - XP. It ran on an operating system called emOS.
Much of the content released for this device was Christian in nature, including Bible eBooks.
The hiebook devices were aesthetically appealing for the time, but didn't stick around very long, and were soon discontinued.
See the MobileRead entry for hiebook for more information.
This is where some hiebook content used to be sold.