[OS X TeX] Dots in file names

[André Bellaïche]

How can you tell \includegraphics or TeXShop or teTeX or MacOS that  
in "Fig.I.1.1" there is no extension (the system is aware that this  
is a .eps file, of course), and that in "Fig.I.1.1.eps", the  
extension is .eps. ?

Instead of that :

  \includegraphics{Fig.I.1.1} returns   ! LaTeX Error: Unknown  
graphics extension: .I.1.1.

\includegraphics{Fig.I.1.1.eps} returns   ! LaTeX Error: Unknown  
graphics extension: .I.1.1.eps.

By the way, Fig-I-1-1.eps works, but any file name beginning with a  
"-" sign yields an immediate fatal error.

If dots, slashes, backslashes are forbidden, and "-" is hazardous,  
how do you separate chapter, section, etc. numbers in file names ?  
Using dots, as used by LaTeX, seemed to be the standard way,...

André Bellaïche

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