Make the open file dialog used with the axis gui full screen: 1) Put this line in your /home/yourusername/.axisrc: #---------------------------------------------------------------- root_window.tk.call("source","bigfileopen.tcl") #---------------------------------------------------------------- 2) Create a file named bigfileopen.tcl in your config directory with these contents: #---------------------------------------------------------------- if {[info proc tkgof] == ""} {rename tk_getOpenFile tkgof} proc tk_getOpenFile {args} { # location on screen: set xoff 0 set yoff 0 # get width and height for max screen set maxsize [wm maxsize .] set width [lindex $maxsize 0] set height [lindex $maxsize 1] # alternately, just set width, height, and offsets explicitly: # set width 800 # set height 600 # set xoff 100 # set yoff 100 after 0 [list wm geometry .__tk_filedialog ${width}x${height}+${xoff}+${yoff}] return [eval tkgof $args] } #---------------------------------------------------------------- An alternate method for 1) (instead of using .axisrc). Add to the [DISPLAY] section of the config ini file: #---------------------------------------------------------------- [DISPLAY] USER_COMMAND_FILE = bigfileopen.py ... #---------------------------------------------------------------- Create a file named bigfileopen.py with contents: #---------------------------------------------------------------- root_window.tk.call("source","bigfileopen.tcl") #---------------------------------------------------------------- Put the file bigfileopen.py (as well as bigfileopen.tcl) in the config directory (where the ini file is located). Using [DISPLAY]USER_COMMAND_FILE has the an advantage over a .axisrc file in that it is part of the ini configuration and not dependent on the user As pointed out on linuxcnc-devel, this hack is not portable across tcl versions. Tested ok on tcl8.5 (ubuntu lucid) Tested ok on tcl8.6 (debian jessie) wikipedia says: tcl8.5 released dec 2007 tcl8.6 released dec 2012 not sure if there will ever be a tcl8.7 but, if you use this hack in your personal setup, be sure to review it every 5 years or so.