Hi! First of all many thanks for your help. Here what I found: This is a part of mime.types: # # Application-generated files... # #application/msword doc string(0,) application/pdf pdf string(0,%PDF) application/postscript ai eps ps string(0,%!) string(0,<04>%!) \ contains(0,128,<1B>%-12345X) + \ (contains(0,1024,"LANGUAGE=POSTSCRIPT") \ contains(0,1024,"LANGUAGE = Postscript") \ contains(0,1024,"LANGUAGE = PostScript") \ contains(0,1024,"LANGUAGE = POSTSCRIPT") \ (contains(0,1024,<0a>%!) + \ !contains(0,1024,"ENTER LANGUAGE"))) application/vnd.hp-HPGL hpgl string(0,<1B>&)\ string(0,<1B>E<1B>%0B) \ string(0,<1B>%-1B) string(0,<201B>)\ string(0,BP;) string(0,IN;) string(0,DF;) \ string(0,BPINPS;) \ (contains(0,128,<1B>%-12345X) + \ (contains(0,1024,"LANGUAGE=HPGL") \ contains(0,1024,"LANGUAGE = HPGL"))) ######################################################################## # # Image files... # image/gif gif string(0,GIF87a) string(0,GIF89a) image/png png string(0,<89>PNG) image/jpeg jpeg jpg jpe string(0,) &&\ (char(3,0xe0) char(3,0xe1) char(3,0xe2) char(3,0xe3)\ char(3,0xe4) char(3,0xe5) char(3,0xe6) char(3,0xe7)\ char(3,0xe8) char(3,0xe9) char(3,0xea) char(3,0xeb)\ char(3,0xec) char(3,0xed) char(3,0xee) char(3,0xef)) image/tiff tiff tif string(0,MM) string(0,II) image/x-photocd pcd string(2048,PCD_IPI) image/x-portable-anymap pnm image/x-portable-bitmap pbm string(0,P1) string(0,P4) image/x-portable-graymap pgm string(0,P2) string(0,P5) image/x-portable-pixmap ppm string(0,P3) string(0,P6) image/x-sgi-rgb rgb sgi bw icon short(0,474) image/x-xbitmap xbm image/x-xpixmap xpm ascii(0,1024) + string(3,"XPM") #image/x-xwindowdump xwd string(4,<00000007>) image/x-sun-raster ras string(0,<59a66a95>) #image/fpx fpx image/x-alias pix short(8,8) short(8,24) image/x-bitmap bmp string(0,BM) && !printable(2,14) image/x-icon ico ######################################################################## # # Text files... # application/x-cshell csh printable(0,1024) + string(0,#!) +\ (contains(2,80,/csh) contains(2,80,/tcsh)) application/x-perl pl printable(0,1024) + string(0,#!) +\ contains(2,80,/perl) application/x-shell sh printable(0,1024) + string(0,#!) +\ (contains(2,80,/bash) contains(2,80,/ksh)\ contains(2,80,/sh) contains(2,80,/zsh)) application/x-csource c cxx cpp cc C h hpp \ printable(0,1024) + \ (string(0,/*) string(0,//) string(0,#include) contains(0,1024,<0a>#include) \ string(0,#define) contains(0,1024,<0a>#define)) text/html html htm printable(0,1024) +\ (istring(0,"") istring(0,"") application/vnd.cups-pdf application/vnd.cups-postscript application/vnd.cups-ppd ppd string(0,"*PPD-Adobe:") application/vnd.cups-raster string(0,"RaSt") string(0,"tSaR") application/vnd.cups-raw (string(0,<1B>E) + !string(2,<1B>%0B)) \ string(0,<1B>@) \ (contains(0,128,<1B>%-12345X) + \ (contains(0,1024,"LANGUAGE=PCL") \ contains(0,1024,"LANGUAGE = PCL"))) ######################################################################## # # Raw print file support... # # Comment the following type to prevent raw file printing. # application/octet-stream # Here the output of lpinfo: luca@luca:~$ lpinfo -v network socket direct usb://EPSON/Stylus%20COLOR%20580 direct hp:/no_device_found network http network ipp network lpd direct parallel:/dev/lp0 direct canon:/dev/lp0 direct epson:/dev/lp0 network smb luca@luca:~$ And here the backend: luca@luca:~$ /usr/lib/cups/backend/usb direct usb://EPSON/Stylus%20COLOR%20580 "EPSON Stylus COLOR 580" "EPSON Stylus COLOR 580 USB #1" "MFG:EPSON;CMD:ESCPL2,BDC,D4;MDL:Stylus COLOR 580;CLS:PRINTER;DES:EPSON Stylus COLOR 580;��" luca@luca:~$ Many thanks again. Cheers