xmlReadFile read an xml file,return null,prompting that:
i/o warning:failed to load external entity "culture.xml",
while xmlReaderForFile reading the same file from the same path on disk
is correct.

I am not sure this is a bug,maybe it is the harddisk problem,
but xmlReaderForFile reads correctly,which confused me.

what I had tried:
copy other content from another xml file to the file:culture.xml,
the problem occured again;
howerer,
copy the oringinal content from culture to B xml file,
then the program reading file from B runs correctly.

expecting reply if possible.
thx.