Originally Posted by The "Unhelpful" Thread

OEM / Beta versions (any version number below 1.20)
Short for "Original Equipment Manufacturer", these versions are shipped with customised computers when JJ2 was released, hence their nickname. Of course, they eventually made their way onto the net as everybody thought it was the full version. However, as the lower version numbers indicate, these are actually beta versions. Of all versions in the list, the OEM versions are the odd ones out because of different coding and encryption of data. While all retail versions use file formats like .j2l, .j2t and the like, the OEM versions still had formats like .lev and common formats for music (.it and .s3m). Plus they didn't have online capabilities at the time they were created. At the moment version 1.00g is the most common one floating around followed by 1.00h, but another has also turned up: version 1.10o. That version has standard JJ2-specific formats, which means the encryption had taken place at the time it was made.