Can't open zip file to read unicode characters

Question

I have a problem to open zip file and read inner text file content as Unicode characters. so when call this function , the file opens and I can read the inner text file.

unzFile uz = unzOpen("<path to file>\\sample.docx");

but I need to read inner text file as Unicode file. so when I replace the function call with this

unzFile uz = unzOpen64(L"<path to file>\\sample.docx");

the function returns NULL, i.e. file does not opened.

Any ideas about this ?