diff --git a/modules/juce_core/native/juce_win32_Files.cpp b/modules/juce_core/native/juce_win32_Files.cpp
index 8dabf7db03..6dab87dcd4 100644
--- a/modules/juce_core/native/juce_win32_Files.cpp
+++ b/modules/juce_core/native/juce_win32_Files.cpp
@@ -52,10 +52,10 @@ namespace WindowsFileHelpers
         if (path.isNotEmpty() && path[1] == ':' && path[2] == 0)
             path << '\\';
 
-        const int numBytes = CharPointer_UTF16::getBytesRequiredFor (path.getCharPointer()) + 4;
+        const size_t numBytes = CharPointer_UTF16::getBytesRequiredFor (path.getCharPointer()) + 4;
         HeapBlock<WCHAR> pathCopy;
         pathCopy.calloc (numBytes, 1);
-        path.copyToUTF16 (pathCopy, numBytes);
+        path.copyToUTF16 (pathCopy, (int) numBytes);
 
         if (PathStripToRoot (pathCopy))
             path = static_cast <const WCHAR*> (pathCopy);
@@ -169,10 +169,10 @@ bool File::moveToTrash() const
         return true;
 
     // The string we pass in must be double null terminated..
-    const int numBytes = CharPointer_UTF16::getBytesRequiredFor (fullPath.getCharPointer()) + 8;
+    const size_t numBytes = CharPointer_UTF16::getBytesRequiredFor (fullPath.getCharPointer()) + 8;
     HeapBlock<WCHAR> doubleNullTermPath;
     doubleNullTermPath.calloc (numBytes, 1);
-    fullPath.copyToUTF16 (doubleNullTermPath, numBytes);
+    fullPath.copyToUTF16 (doubleNullTermPath, (int) numBytes);
 
     SHFILEOPSTRUCT fos = { 0 };
     fos.wFunc = FO_DELETE;
@@ -704,7 +704,10 @@ bool Process::openDocument (const String& fileName, const String& parameters)
 
 void File::revealToUser() const
 {
+   #pragma warning (push)
+   #pragma warning (disable: 4090) // (alignment warning)
     ITEMIDLIST* const itemIDList = ILCreateFromPath (fullPath.toWideCharPointer());
+   #pragma warning (pop)
 
     if (itemIDList != nullptr)
     {
diff --git a/modules/juce_core/streams/juce_MemoryOutputStream.cpp b/modules/juce_core/streams/juce_MemoryOutputStream.cpp
index 4ff05f9c2f..50536a54f6 100644
--- a/modules/juce_core/streams/juce_MemoryOutputStream.cpp
+++ b/modules/juce_core/streams/juce_MemoryOutputStream.cpp
@@ -162,7 +162,7 @@ String MemoryOutputStream::toString() const
 
 OutputStream& JUCE_CALLTYPE operator<< (OutputStream& stream, const MemoryOutputStream& streamToRead)
 {
-    stream.write (streamToRead.getData(), streamToRead.getDataSize());
+    stream.write (streamToRead.getData(), (int) streamToRead.getDataSize());
     return stream;
 }
 
diff --git a/modules/juce_core/zip/juce_GZIPCompressorOutputStream.cpp b/modules/juce_core/zip/juce_GZIPCompressorOutputStream.cpp
index abb6282a1a..858ceccc25 100644
--- a/modules/juce_core/zip/juce_GZIPCompressorOutputStream.cpp
+++ b/modules/juce_core/zip/juce_GZIPCompressorOutputStream.cpp
@@ -181,11 +181,11 @@ public:
                 {
                     MemoryBlock data (rng.nextInt (2000) + 1);
 
-                    for (int k = data.getSize(); --k >= 0;)
+                    for (int k = (int) data.getSize(); --k >= 0;)
                         data[k] = (char) rng.nextInt (255);
 
-                    original.write (data.getData(), data.getSize());
-                    zipper  .write (data.getData(), data.getSize());
+                    original.write (data.getData(), (int) data.getSize());
+                    zipper  .write (data.getData(), (int) data.getSize());
                 }
             }
 
diff --git a/modules/juce_graphics/image_formats/pnglib/pngrutil.c b/modules/juce_graphics/image_formats/pnglib/pngrutil.c
index f6973659ae..6a705a4a6f 100644
--- a/modules/juce_graphics/image_formats/pnglib/pngrutil.c
+++ b/modules/juce_graphics/image_formats/pnglib/pngrutil.c
@@ -3143,7 +3143,7 @@ defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
    if ((png_uint_32)png_ptr->rowbytes + 1 > (png_uint_32)65536L)
       png_error(png_ptr, "This image requires a row greater than 64KB");
 #endif
-   if ((png_uint_32)png_ptr->rowbytes > (png_uint_32)(PNG_SIZE_MAX - 1))
+   if ((png_uint_32)png_ptr->rowbytes > (png_uint_32) -2)
       png_error(png_ptr, "Row has too many bytes to allocate in memory.");
    png_ptr->prev_row = (png_bytep)png_malloc(png_ptr, (png_uint_32)(
       png_ptr->rowbytes + 1));
diff --git a/modules/juce_graphics/native/juce_win32_DirectWriteTypeface.cpp b/modules/juce_graphics/native/juce_win32_DirectWriteTypeface.cpp
index 0ac1775d32..0f1869c7fe 100644
--- a/modules/juce_graphics/native/juce_win32_DirectWriteTypeface.cpp
+++ b/modules/juce_graphics/native/juce_win32_DirectWriteTypeface.cpp
@@ -136,10 +136,10 @@ public:
         const size_t len = textUTF32.length();
 
         HeapBlock <UINT16> glyphIndices (len);
-        dwFontFace->GetGlyphIndices (textUTF32, len, glyphIndices);
+        dwFontFace->GetGlyphIndices (textUTF32, (UINT32) len, glyphIndices);
 
         HeapBlock <DWRITE_GLYPH_METRICS> dwGlyphMetrics (len);
-        dwFontFace->GetDesignGlyphMetrics (glyphIndices, len, dwGlyphMetrics, false);
+        dwFontFace->GetDesignGlyphMetrics (glyphIndices, (UINT32) len, dwGlyphMetrics, false);
 
         float x = 0;
         for (size_t i = 0; i < len; ++i)
@@ -156,9 +156,9 @@ public:
         const size_t len = textUTF32.length();
 
         HeapBlock <UINT16> glyphIndices (len);
-        dwFontFace->GetGlyphIndices (textUTF32, len, glyphIndices);
+        dwFontFace->GetGlyphIndices (textUTF32, (UINT32) len, glyphIndices);
         HeapBlock <DWRITE_GLYPH_METRICS> dwGlyphMetrics (len);
-        dwFontFace->GetDesignGlyphMetrics (glyphIndices, len, dwGlyphMetrics, false);
+        dwFontFace->GetDesignGlyphMetrics (glyphIndices, (UINT32) len, dwGlyphMetrics, false);
 
         float x = 0;
         for (size_t i = 0; i < len; ++i)
diff --git a/modules/juce_gui_basics/native/juce_win32_Windowing.cpp b/modules/juce_gui_basics/native/juce_win32_Windowing.cpp
index a7726d1ff6..feabc5169a 100644
--- a/modules/juce_gui_basics/native/juce_win32_Windowing.cpp
+++ b/modules/juce_gui_basics/native/juce_win32_Windowing.cpp
@@ -959,7 +959,7 @@ private:
             // this name has to be different for each app/dll instance because otherwise poor old Windows can
             // get a bit confused (even despite it not being a process-global window class).
             String windowClassName ("JUCE_");
-            windowClassName << (int) (Time::currentTimeMillis() & 0x7fffffff);
+            windowClassName << String::toHexString (Time::currentTimeMillis());
 
             HINSTANCE moduleHandle = (HINSTANCE) Process::getCurrentModuleInstanceHandle();