• It only provides limited extensibility: there can only be one HandleExtraFileTypes installed into ImageJ at a time, so all desired modifications to the plugin must be somehow combined. This makes it impossible to, for example, ship a different HandleExtraFileTypes on two different ImageJ Update Sites and have both additions be available in the same installation.
• Data formats added in this manner cannot override or extend ImageJ1”s built in support for certain file formats. In particular, ImageJ1 supports only a subset of the TIFF specification, and this issue cannot be circumvented via HandleExtraFileTypes modifications.