Are there free software that can open .ai file created in Adobe Illustrator?
Illustrator Recovery Toolbox will restore and convert an .AI file so you can view. There is a demo version so you can check the tool whether it will be useful to you or not. http://www.oemailrecovery.com/illustrator_recovery.html
I don't use AI here, but I have some sample AI files for testing purposes, and Illustrator Recovery Toolbox can open them. As with most things Adobe, AI is a complex format, so don't be surprised that they can open some AI files and not others. At the end of the day, AI is an Adobe proprietary format, so I suspect the only total support is from Adobe itself. Wikipedia has a list programs that support AI files, which, in the free arena, contains Ghostscript and XnView (via Ghostscript), so I guess they represent other free possibilities for sglee, although I haven't tried them (btw, that may be why IrfanView works — it utilizes Ghostscript, too — although neither IrfanView nor GIMP is on the Wikipedia list).
It may not open CC version of Illustrator, I think it will take up to version 8.
..I personally use a few ways, Rhino3D and Inkscape and the rename to pdf,.. although, it depends.. do a search and you may find something which suits your needs,...
I hope this posts will help you also.
Thank you all for your advice! The issue has been resolved.
If you have Acrobat Reader, just rename the files from *.ai to *.pdf to view them.
Retrieving data ...