Bug in import(...) on Windows?

[Andrey Zherikov]

My code (test.d):
=======
void main()
{
     import std.path: buildPath;
     pragma(msg, import("file"));
     pragma(msg, import(buildPath(".", "file")));
}
=======

Content of file "file" is one line with "hello" text.

Running command: dmd -J. -run test.d

Result on Ubuntu:
=======
hello

hello

=======

Result on Windows:
=======
hello

test.d(46): Error: file ".\\file" cannot be found or not in a 
path specified with -J
test.d(46):        while evaluating pragma(msg, 
import(buildPath([".", "file"][])))
=======

Is this a bug in dmd?