From Tracker Software PDF SDK
Gets an extension by its unique name.
HRESULT GetExtension([in] LPWSTR sExtID, [out, retval] IUnknown** pExt);
- [in] Value containing the name of the extension to return. Possible values:
- "AUX" - Getting IAUX_Inst
- "AFS" - Getting IAFS_Inst
- "PXS" - Getting IPXS_Inst
- "IXC" - Getting IIXC_Inst
- [out, retval] Returns pointer to the IUnknown interface of the extension.
Returns S_OK if operation was successful or error code in other cases.