from inkscapewiki:
http://www.inkscape.org/wiki/index.php? ... edirect=no
"[edit] Open *.AI
* install perl and optionally Image::Magick
* Only handles Illustrator versions prior to version 9 (version 9 onwards stores files as PDF according to
https://createpdf.adobe.com/cgi-feeder. ... &LOC=en_US)
[edit] Save *.AI
* requires pstoedit with the ps2ai filter
* uses Inkscapes internal ps output extension"
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from inkscape FAQ:
http://wiki.inkscape.org/wiki/index.php ... Fexport.3F
"[edit] What formats can Inkscape import/export?
Inkscape natively supports opening or importing SVG, SVGZ (gzipped SVG), PDF, and AI (Adobe Illustrator) formats.
With the help of extensions, Inkscape can open a number other vector formats. For importing PostScript or EPS, you need to install Ghostscript and make sure ps2pdf is in your PATH. For formats of Dia, XFig, or Sketch, you need to have these programs installed. For CorelDraw, CGM, and SK1 files, you need to have UniConverter installed."
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So it seems you need to install Ghostscript and pstoedit. I didn't do it myself. I hope someone more tech-savvy will try it and report if it works.
That ps2ai filter seems to be part of Ghostscript.
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pstoedit can be found here:
http://www.pstoedit.net/
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win32 ghostscript download here:
http://mirror.cs.wisc.edu/pub/mirrors/g ... 863w32.exe