It's not R problem but specification of windows file system.
see MSDN:
http://msdn2.microsoft.com/en-us/library/aa365247.aspx
On 1/15/07, Brandt, T. (Tobias) <[EMAIL PROTECTED]> wrote:
> Hi
>
> I cannot seem to create any files that have the name "CON" before the file
> extension, i.e. all of the following fail:
>
> > pdf("CON.pdf")
> Error in pdf("CON.pdf") : unable to start device pdf
> > jpeg('CON.jpeg')
> Error in jpeg("CON.jpeg") : unable to start device devWindows
> > png('CON.png')
> Error in png("CON.png") : unable to start device devWindows
> > sink('CON.txt')
> Error in file(file, ifelse(append, "a", "w")) :
> unable to open connection
> >
>
> Any filename other than this works fine.
>
> > png('ICON.png')
> > dev.off()
> null device
> 1
> > png('CON1.png')
> > dev.off()
> null device
> 1
> > sink('log.txt')
> > sink()
> >
>
> Remembering that in the old DOS days, commands like 'copy CON myfile.bat'
> were common, I suspected that this has something to do with CON being a
> reserved word so I tried to create the files manually in Windows explorer.
> Creating files named 'CON.png', 'CON.pdf', 'CON.txt' all work fine. However
> I did notice that Windows won't let me create a file named just "CON".
> However since the devices that I'm trying to create have extensions, I don't
> understand why they fail.
>
> Who can help?
>
> Thanks
> Tobias
>
>
> > version
> _
> platform i386-pc-mingw32
> arch i386
> os mingw32
> system i386, mingw32
> status
> major 2
> minor 3.1
> year 2006
> month 06
> day 01
> svn rev 38247
> language R
> version.string Version 2.3.1 (2006-06-01)
> >
>
> > Sys.info()
> sysname release
> version nodename
> "Windows" "NT 5.1" "(build 2600)
> Service Pack 2"
> machine login
> user
> "x86"
> >
>
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