SnapGene can open some Geneious Prime .geneious files, see this link.
Provided a Geneious Prime file (.geneious) contains a single DNA or RNA sequence then it can be imported as a sequence into SnapGene. Any annotation (feature) information associated with the nucleotide sequence will also be imported and displayed in SnapGene.
SnapGene cannot import .geneious files that contain more than one sequence.
SnapGene cannot currently import Geneious Prime files that contain one or more alignments, assemblies, sequence list files or other Geneious data types.