shlwapi: Change '/'->'\' only for file protocol in UrlCanonicalize.

dlls/shlwapi/tests/path.c

@@ -75,6 +75,8 @@ const TEST_URL_CANONICALIZE TEST_CANONICALIZE[] = {
     {"file:///c://tests/foo%20bar", URL_FILE_USE_PATHURL, S_OK, "file://c:\\\\tests\\foo bar"},
     {"file:///c:\\tests\\foo bar", 0, S_OK, "file:///c:/tests/foo bar"},
     {"file:///c:\\tests\\foo bar", URL_DONT_SIMPLIFY, S_OK, "file:///c:/tests/foo bar"},
+    {"http://www.winehq.org/site/about", URL_FILE_USE_PATHURL, S_OK, "http://www.winehq.org/site/about"},
+    {"file_://www.winehq.org/site/about", URL_FILE_USE_PATHURL, S_OK, "file_://www.winehq.org/site/about"},
 };
 
 typedef struct _TEST_URL_ESCAPE {

dlls/shlwapi/url.c

@@ -330,7 +330,9 @@ HRESULT WINAPI UrlCanonicalizeW(LPCWSTR pszUrl, LPWSTR pszCanonicalized,
     LPWSTR lpszUrlCpy, wk1, wk2, mp, mp2, root;
     INT nByteLen, state;
     DWORD nLen, nWkLen;
-    WCHAR slash = dwFlags & URL_FILE_USE_PATHURL ? '\\' : '/';
+    WCHAR slash = '/';
+
+    static const WCHAR wszFile[] = {'f','i','l','e',':'};
 
     TRACE("(%s %p %p 0x%08lx)\n", debugstr_w(pszUrl), pszCanonicalized,
 	  pcchCanonicalized, dwFlags);
@@ -341,6 +343,10 @@ HRESULT WINAPI UrlCanonicalizeW(LPCWSTR pszUrl, LPWSTR pszCanonicalized,
     nByteLen = (lstrlenW(pszUrl) + 1) * sizeof(WCHAR); /* length in bytes */
     lpszUrlCpy = HeapAlloc(GetProcessHeap(), 0, nByteLen);
 
+    if((dwFlags & URL_FILE_USE_PATHURL) && nByteLen >= sizeof(wszFile)
+            && !memcmp(wszFile, pszUrl, sizeof(wszFile)))
+        slash = '\\';
+
     /*
      * state =
      *         0   initial  1,3