State aid — Belgium, France, Luxembourg — Decisions to open a formal investigation — State aids SA.34925 (12/C-2) (ex 12/N-2) — Second prolongation of the temporary refinancing guarantee to Dexia — by Belgium, SA.34928 (12/C-2) (ex 12/N-2) — Second prolongation of the temporary refinancing guarantee to Dexia — by France, SA.34927 (12/C-2) (ex 12/N-2) — Second prolongation of the temporary refinancing guarantee to Dexia — by Luxembourg — Invitation to submit comments pursuant to Article 108(2) TFEU Text with EEA relevance