@jim said:
One thing you can try while I work on a fix is to open the .dxf file in an editor such as Notepad++, set the encoding to utf-8, then save the file. It should import correctly.
But might lose some characters such as this one:
> puts "\x90".force_encoding("cp1251").encode("utf-8")
> Ρ
>
I did the test that you have advised me, but nothing has changed.
Instead I have converted the files in ANSI, I saved it, and then I imported into Sketchup and ...... cheers now works. 
@jim said:
Oh so it's an encoding issue. Can you share the file here or in a private message? I don't have an example with which to work out a solution.
Hello Jim I have attached the file you that I can not open in Sketchup 2016.
If this can be of help, this file was saved as 'AutoCAD 2013 Compatible DXF (*.dxf)
Hello Jim.
No before pressing 'Import' in Ruby Console nothing appears, but after I pressed the 'Import' button appears this error:
Error: #<Encoding::UndefinedConversionError: "\x90" to UTF-8 in conversion from Windows-1252 to UTF-8>
C:/Users/Roberto/AppData/Roaming/SketchUp/SketchUp 2016/SketchUp/Plugins/jf-FreeDXF/dxf2ruby.rb:181:in gets' C:/Users/Roberto/AppData/Roaming/SketchUp/SketchUp 2016/SketchUp/Plugins/jf-FreeDXF/dxf2ruby.rb:181:in read_codes'
C:/Users/Roberto/AppData/Roaming/SketchUp/SketchUp 2016/SketchUp/Plugins/jf-FreeDXF/dxf2ruby.rb:58:in parse' C:/Users/Roberto/AppData/Roaming/SketchUp/SketchUp 2016/SketchUp/Plugins/jf-FreeDXF/freedxf.rb:269:in import'
C:/Users/Roberto/AppData/Roaming/SketchUp/SketchUp 2016/SketchUp/Plugins/jf-FreeDXF/freedxf.rb:236:in do_import' C:/Users/Roberto/AppData/Roaming/SketchUp/SketchUp 2016/SketchUp/Plugins/jf-FreeDXF/freedxf.rb:136:in block in do_options'
C:/Users/Roberto/AppData/Roaming/SketchUp/SketchUp 2016/SketchUp/Plugins/jf-FreeDXF/SKUI/events.rb:82:in call' C:/Users/Roberto/AppData/Roaming/SketchUp/SketchUp 2016/SketchUp/Plugins/jf-FreeDXF/SKUI/events.rb:82:in block in trigger_event'
C:/Users/Roberto/AppData/Roaming/SketchUp/SketchUp 2016/SketchUp/Plugins/jf-FreeDXF/SKUI/events.rb:78:in each' C:/Users/Roberto/AppData/Roaming/SketchUp/SketchUp 2016/SketchUp/Plugins/jf-FreeDXF/SKUI/events.rb:78:in trigger_event'
C:/Users/Roberto/AppData/Roaming/SketchUp/SketchUp 2016/SketchUp/Plugins/jf-FreeDXF/SKUI/window.rb:357:in event_control_callback' C:/Users/Roberto/AppData/Roaming/SketchUp/SketchUp 2016/SketchUp/Plugins/jf-FreeDXF/SKUI/window.rb:311:in callback_handler'
C:/Users/Roberto/AppData/Roaming/SketchUp/SketchUp 2016/SketchUp/Plugins/jf-FreeDXF/SKUI/window.rb:269:in block in add_callback' SketchUp:1:in call'
Good evening.
I have installed the latest version freeDXF 16th in Sketchup 2016, but I can not
to import any DXF files.
I tried to install the older version of freeDXF but nothing has changed.
Some solution?