In 2012, Rosenauer earned a place in the European Tour Event 1 in Vienna by defeating Alexander Tauber and Tomas Seyler in the European qualifier. He played Richie Burnett in the first round and lost 4–6. Rosenauer also qualified for the second European Tour event in June, with wins over Karsten Kornath and Jyhan Artut in the Home Nation Qualifier. He beat world number 8 Andy Hamilton in the first round 6–4, before losing to Dave Chisnall 1–6 in round two. Rosenauer lost to Ronnie Baxter 1–6 in the first round of the 2012 European Championship. In an attempt to reach the 2013 World Championship, Rosenauer was defeated 5–6 by Dragutin Horvat in the quarter-finals of the Central European Qualifier. Rosenauer was ranked world number 78 after the event, outside of the top 64 who retain their tour cards for 2013.