Index: src/os_win.c
==================================================================
--- src/os_win.c
+++ src/os_win.c
@@ -5267,22 +5267,27 @@
   sqlite3_vfs *pVfs,            /* Pointer to vfs object */
   const char *zRelative,        /* Possibly relative input path */
   int nFull,                    /* Size of output buffer in bytes */
   char *zFull                   /* Output buffer */
 ){
+#if !SQLITE_OS_WINCE && !SQLITE_OS_WINRT && !defined(__CYGWIN__)
+  DWORD nByte;
+  void *zConverted;
+  char *zOut;
+#endif
 
-#if defined(__CYGWIN__)
-  SimulateIOError( return SQLITE_ERROR );
-  UNUSED_PARAMETER(nFull);
-  assert( nFull>=pVfs->mxPathname );
   /* If this path name begins with "/X:", where "X" is any alphabetic
   ** character, discard the initial "/" from the pathname.
   */
   if( zRelative[0]=='/' && winIsDriveLetterAndColon(zRelative+1) ){
     zRelative++;
   }
 
+#if defined(__CYGWIN__)
+  SimulateIOError( return SQLITE_ERROR );
+  UNUSED_PARAMETER(nFull);
+  assert( nFull>=pVfs->mxPathname );
   if ( sqlite3_data_directory && !winIsVerbatimPathname(zRelative) ){
     /*
     ** NOTE: We are dealing with a relative path name and the data
     **       directory has been set.  Therefore, use it as the basis
     **       for converting the relative path name to an absolute
@@ -5334,17 +5339,10 @@
   return SQLITE_OK;
 #endif
 
 #if (SQLITE_OS_WINCE || SQLITE_OS_WINRT) && !defined(__CYGWIN__)
   SimulateIOError( return SQLITE_ERROR );
-  /* If this path name begins with "/X:", where "X" is any alphabetic
-  ** character, discard the initial "/" from the pathname.
-  */
-  if( zRelative[0]=='/' && winIsDriveLetterAndColon(zRelative+1) ){
-    zRelative++;
-  }
-
   /* WinCE has no concept of a relative pathname, or so I am told. */
   /* WinRT has no way to convert a relative path to an absolute one. */
   if ( sqlite3_data_directory && !winIsVerbatimPathname(zRelative) ){
     /*
     ** NOTE: We are dealing with a relative path name and the data
@@ -5359,21 +5357,10 @@
   }
   return SQLITE_OK;
 #endif
 
 #if !SQLITE_OS_WINCE && !SQLITE_OS_WINRT && !defined(__CYGWIN__)
-  DWORD nByte;
-  void *zConverted;
-  char *zOut;
-
-  /* If this path name begins with "/X:", where "X" is any alphabetic
-  ** character, discard the initial "/" from the pathname.
-  */
-  if( zRelative[0]=='/' && winIsDriveLetterAndColon(zRelative+1) ){
-    zRelative++;
-  }
-
   /* It's odd to simulate an io-error here, but really this is just
   ** using the io-error infrastructure to test that SQLite handles this
   ** function failing. This function could fail if, for example, the
   ** current working directory has been unlinked.
   */