Make extens stricter

DepotDownloader/PlatformUtilities.cs

@@ -147,11 +147,13 @@ namespace DepotDownloader
         }
 
         #region WIN32_CONSOLE_STUFF
-        [DllImport("kernel32.dll", SetLastError = true)]
+        [DllImport("kernel32.dll", SetLastError = true, ExactSpelling = true)]
+        [DefaultDllImportSearchPaths(DllImportSearchPath.System32)]
         static extern uint GetConsoleProcessList(uint[] processList, uint processCount);
 
-        [DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)]
-        static extern int MessageBox(IntPtr hWnd, string text, string caption, uint type);
+        [DllImport("user32.dll", SetLastError = true, ExactSpelling = true, CharSet = CharSet.Unicode)]
+        [DefaultDllImportSearchPaths(DllImportSearchPath.System32)]
+        static extern int MessageBoxW(IntPtr hWnd, string text, string caption, uint type);
 
         const uint MB_OK = 0x0;
         const uint MB_ICONWARNING = 0x30;
@@ -167,7 +169,7 @@ namespace DepotDownloader
                 return;
             }
 
-            _ = MessageBox(
+            _ = MessageBoxW(
                 IntPtr.Zero,
                 "Depot Downloader is a console application; there is no GUI.\n\nIf you do not pass any command line parameters, it prints usage info and exits.\n\nYou must use this from a terminal/console.",
                 "DepotDownloader",