What file formats can I send from KakaoTalk PC?
You can send files from KakaoTalk PC in the following formats: 
jpg, jpeg, gif, bmp, png, tif, tga and psd
mp4, m4v, avi, asf, wmv, mkv, ts, mpg, mpeg, mov, flv and ogv 
mp3, wav, flac, tta, tak, aac, wma, ogg and m4a
doc, docx, hwp, txt, rtf, xml, pdf, wks, wps, xps, md, odf, csv, tsv, xls, xlsx, ppt, pptx, pages, key and numbers
[Compressed files]
zip, gz, bz2, rar, 7z, lzh and alz