On the page:

http://wiki.povray.org/content/Reference:File_Output_Options

we talk about :

.. S System-specific format: See the notation at the end of this section.

and at the end of the section we have this:

Note: System-specific or type "s" output file format is being retained 
for legacy support reasons. Windows and Unix mapping remains the same, 
BMP and TGA respectively, however on Macintosh it has been changed to 
PNG, and a warning is issued when type "s" is used.

+FS or Output_File_Type=S die outright for syntax on my linux Ubuntu 
machine in 3.7 and 3.71 master.

When I look at the code the only platform where I see build support (the 
right set of #declares) to get image sys image support is windows. I see 
no indication of a warning being generated in any case,
but perhaps I missed it in the code.

I think the note should read something like:

Note: System-specific or type "s" output file format is being retained 
for legacy support reasons on the Windows versions of POV-Ray and the 
type remains BMP.

Bill P.

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