Although both ODB and APR file types are used by ESRI ArcView software, it doesn't seem like it is possible to convert them between each other. The same goes for other existing ODB and APR types, which means odb to apr conversion is unlikely.
This conversion entry was verified by us and conversion was flagged as wrong or not possible.
Usually this happens when the conversion would try to convert different types of data between each other, such as audio to image, or it is not possible because incompatibility between programs, caused by closed file formats, very limited support etc.
If you find entry that you feel is flagged as bad wrongly, please tell us in the discussion below with as much as information as possible so we can fix it.