Fix self-extracting cab support, cf. #836
Fix self-extracting cab support, cf. #836

leafo/itchio-app,itchio/itchio-app,itchio/itch,leafo/itchio-app,itchio/itch,leafo/itchio-app,itchio/itch,itchio/itch,itchio/itchio-app,itchio/itch,itchio/itch,itchio/itchio-app