Document: 

Microsoft office - .doc, .docx, .ppt, .pptx, .xls, .xlsx

iWorks - .key, .numbers, .pages

Others - .pdf, .html, .txt, .rtf

Photo: .bmp, .cur, .gif, .jpg, .tif, .xbm, .png

Audio: .aac, .aif, .aiff, .caf, .m4a, .mp3, .wav, .wav

Video: .m4v, .mp4, .mov, .avi, .mkv, .mpg, .mpv, .rm, .rmvb, .ts, .wmv, .flv, .vcf, .zip