ExtendSim is computer software that is designated EAR99, which means it is not specifically controlled for export.
As an exported item, ExtendSim falls under the Export Administration Regulations (EAR) as administered by the US Department of Commerce's Bureau of Industry and Security, the US State Department's Directorate of Defense Trade Controls, and the US Department of the Treasury's Office of Foreign Assets Control.
ExtendSim is subject to the EAR, but it is designated EAR99 because it is not listed on the CCL (Commerce Control List) for Category 4 (Computers), Product Group D (Software), or for any other CCL Category or Product Group. Therefore, ExtendSim does not require an ECCN (Export Control Classification Number) and does not, in and of itself, require an export license. However, you still must obtain an export license if the shipment that includes ExtendSim will be:
going to an embargoed country.
going to an end-user of concern.
used in support of a prohibited end-use.