It's not just two doublequotes. Just one doublequote, three doublequotes, ... seems any number of doublequotes work.

... but not in C code, only in perl.

Considering the fact that a doublequote is an illegal character in file names in Windows ...

... there can be no file or directory with such a name, so stat() should fail, either with "file not found" or with "invalid file name". But it should not stat() the current directory instead.

Alexander