[XeTeX] What characters are allowed in filenames?

[Philip TAYLOR]

Ari Meir Brodsky wrote:

> I've created a simple file named:
>
> mainfile(parens).tex
>
> It runs fine with both pdfLaTeX and LuaLaTeX, but when I try to run XeLaTeX
> on it, I get the following console output:
>
> --------------------------------------------------------
> This is XeTeX, Version 3.1415926-2.4-0.9998 (MiKTeX 2.9)
> entering extended mode
> ! I can't find file `mainfileparens.tex'.

Confirmed :

> This is XeTeX, Version 3.1415926-2.3-0.9997.5 (Web2C 2011)
>  restricted \write18 enabled.
> entering extended mode
> ! I can't find file `mainfileparens.tex'.
> <*> mainfile(parens).tex
>
> (Press Enter to retry, or Control-Z to exit)
> Please type another input file name:

Philip Taylor