http://bugs.winehq.org/show_bug.cgi?id=15326
--- Comment #20 from Dmitry Timoshkov dmitry@codeweavers.com 2009-06-02 23:03:58 --- (In reply to comment #19)
The test shows the problem with the file being directory\file instead of c:\dir_level1\directory\file on windows if you do a fopen on directory\file it opens the directory in the current execution directory and the file within that directory.. So if you are running the file in C:\student on windows it will look for the file c:\student\test\testthree.txt. In wine it does not work this way.
I don't see how it's related to FindFirstFileExW() and fopen() in your test. Besides, fopen() is not a WinAPI, if you want to write a test - use the API sequence which leads to the problem.
The other issue is a URI parsing issue with the open within kernel32. The first time in the debug output with either +relay or +file that you see what looks to be a uri type file is in FindFirstFileExW. However the failure also occurs within WriteFile.
kernel32 is not supposed to know/parse URI names. As both Juan and me pointed out, you need to find out where it comes from.