Question Detail .xll is extension of ? Excel Backup FileExcel CSV FileExcel Work FileExcel Add-In File Answer: Option D Similar Questions : 1. What is extension of Bit Torrent File ? .bit.torrent.bitorrent.bittorrent Answer: Option B 2. What is extension of comma separated value file ? .cf.ccf.csv.cs Answer: Option C 3. What is extension of Common Gateway Interface Script ? .cg.cgi.cgt.cgl Answer: Option B 4. What is extension of Window script file ? .ws.wt.wsf.wf Answer: Option A 5. What is extension of Uuencoded File ? .ue.u.ee.uue Answer: Option D Read more from - Important File Extensions Questions Answers