diff --git a/dlls/windowscodecs/bmpdecode.c b/dlls/windowscodecs/bmpdecode.c
index a01dc78c616..888f41a6138 100644
--- a/dlls/windowscodecs/bmpdecode.c
+++ b/dlls/windowscodecs/bmpdecode.c
@@ -1217,7 +1217,8 @@ void BmpDecoder_FindIconMask(BmpDecoder *This, ULONG *mask_offset, int *topdown)
     if (This->read_data_func == BmpFrameDecode_ReadUncompressed)
     {
         /* RGB or BITFIELDS data */
-        ULONG width, height, bytesperrow, datasize;
+        UINT width, height;
+        ULONG bytesperrow, datasize;
         IWICBitmapFrameDecode_GetSize(&This->IWICBitmapFrameDecode_iface, &width, &height);
         bytesperrow = (((width * This->bitsperpixel)+31)/32)*4;
         datasize = bytesperrow * height;
diff --git a/dlls/windowscodecs/ddsformat.c b/dlls/windowscodecs/ddsformat.c
index f94f6708c2b..5a947a898b9 100644
--- a/dlls/windowscodecs/ddsformat.c
+++ b/dlls/windowscodecs/ddsformat.c
@@ -1331,7 +1331,8 @@ static HRESULT WINAPI DdsDecoder_Dds_GetFrame(IWICDdsDecoder *iface,
     LARGE_INTEGER seek;
     UINT width, height, depth, block_width, block_height, width_in_blocks, height_in_blocks, size;
     UINT frame_width = 0, frame_height = 0, frame_width_in_blocks = 0, frame_height_in_blocks = 0, frame_size = 0;
-    UINT bytes_per_block, bytesread, i;
+    UINT bytes_per_block, i;
+    DWORD bytesread;
     DdsFrameDecode *frame_decode = NULL;
 
     TRACE("(%p,%u,%u,%u,%p)\n", iface, arrayIndex, mipLevel, sliceIndex, bitmapFrame);
diff --git a/dlls/windowscodecs/decoder.c b/dlls/windowscodecs/decoder.c
index 2c72cdfc1b5..2cd5a2d148f 100644
--- a/dlls/windowscodecs/decoder.c
+++ b/dlls/windowscodecs/decoder.c
@@ -250,7 +250,7 @@ typedef struct {
     DWORD frame;
     struct decoder_frame decoder_frame;
     BOOL metadata_initialized;
-    ULONG metadata_count;
+    UINT metadata_count;
     struct decoder_block* metadata_blocks;
 } CommonDecoderFrame;
 
diff --git a/dlls/windowscodecs/info.c b/dlls/windowscodecs/info.c
index cbe8aae572d..7a9ecf52b5a 100644
--- a/dlls/windowscodecs/info.c
+++ b/dlls/windowscodecs/info.c
@@ -101,8 +101,8 @@ static HRESULT ComponentInfo_GetGUIDValue(HKEY classkey, LPCWSTR value,
     return hr;
 }
 
-static HRESULT ComponentInfo_GetDWORDValue(HKEY classkey, LPCWSTR value,
-    DWORD *result)
+static HRESULT ComponentInfo_GetUINTValue(HKEY classkey, LPCWSTR value,
+    UINT *result)
 {
     LONG ret;
     DWORD cbdata = sizeof(DWORD);
@@ -111,7 +111,7 @@ static HRESULT ComponentInfo_GetDWORDValue(HKEY classkey, LPCWSTR value,
         return E_INVALIDARG;
 
     ret = RegGetValueW(classkey, NULL, value, RRF_RT_DWORD, NULL,
-        result, &cbdata);
+        (DWORD *)result, &cbdata);
 
     if (ret == ERROR_FILE_NOT_FOUND)
     {
@@ -179,7 +179,7 @@ static HRESULT ComponentInfo_GetGuidList(HKEY classkey, LPCWSTR subkeyname,
     }
     else
     {
-        ret = RegQueryInfoKeyW(subkey, NULL, NULL, NULL, actual_size, NULL, NULL, NULL, NULL, NULL, NULL, NULL);
+        ret = RegQueryInfoKeyW(subkey, NULL, NULL, NULL, (DWORD *)actual_size, NULL, NULL, NULL, NULL, NULL, NULL, NULL);
         if (ret != ERROR_SUCCESS)
             hr = HRESULT_FROM_WIN32(ret);
     }
@@ -552,7 +552,8 @@ static const IWICBitmapDecoderInfoVtbl BitmapDecoderInfo_Vtbl = {
 
 static void read_bitmap_patterns(BitmapDecoderInfo *info)
 {
-    UINT pattern_count=0, patterns_size=0;
+    DWORD pattern_count=0;
+    UINT patterns_size=0;
     WCHAR subkeyname[11];
     LONG res;
     HKEY patternskey, patternkey;
@@ -1353,7 +1354,7 @@ static HRESULT WINAPI PixelFormatInfo_GetBitsPerPixel(IWICPixelFormatInfo2 *ifac
 
     TRACE("(%p,%p)\n", iface, puiBitsPerPixel);
 
-    return ComponentInfo_GetDWORDValue(This->classkey, L"BitLength", puiBitsPerPixel);
+    return ComponentInfo_GetUINTValue(This->classkey, L"BitLength", puiBitsPerPixel);
 }
 
 static HRESULT WINAPI PixelFormatInfo_GetChannelCount(IWICPixelFormatInfo2 *iface,
@@ -1363,7 +1364,7 @@ static HRESULT WINAPI PixelFormatInfo_GetChannelCount(IWICPixelFormatInfo2 *ifac
 
     TRACE("(%p,%p)\n", iface, puiChannelCount);
 
-    return ComponentInfo_GetDWORDValue(This->classkey, L"ChannelCount", puiChannelCount);
+    return ComponentInfo_GetUINTValue(This->classkey, L"ChannelCount", puiChannelCount);
 }
 
 static HRESULT WINAPI PixelFormatInfo_GetChannelMask(IWICPixelFormatInfo2 *iface,
@@ -1413,7 +1414,7 @@ static HRESULT WINAPI PixelFormatInfo_SupportsTransparency(IWICPixelFormatInfo2
 
     TRACE("(%p,%p)\n", iface, pfSupportsTransparency);
 
-    return ComponentInfo_GetDWORDValue(This->classkey, L"SupportsTransparency", (DWORD*)pfSupportsTransparency);
+    return ComponentInfo_GetUINTValue(This->classkey, L"SupportsTransparency", (UINT *)pfSupportsTransparency);
 }
 
 static HRESULT WINAPI PixelFormatInfo_GetNumericRepresentation(IWICPixelFormatInfo2 *iface,
@@ -1423,7 +1424,7 @@ static HRESULT WINAPI PixelFormatInfo_GetNumericRepresentation(IWICPixelFormatIn
 
     TRACE("(%p,%p)\n", iface, pNumericRepresentation);
 
-    return ComponentInfo_GetDWORDValue(This->classkey, L"NumericRepresentation", pNumericRepresentation);
+    return ComponentInfo_GetUINTValue(This->classkey, L"NumericRepresentation", pNumericRepresentation);
 }
 
 static const IWICPixelFormatInfo2Vtbl PixelFormatInfo_Vtbl = {
@@ -1682,7 +1683,7 @@ static HRESULT WINAPI MetadataReaderInfo_DoesRequireFullStream(IWICMetadataReade
 {
     MetadataReaderInfo *This = impl_from_IWICMetadataReaderInfo(iface);
     TRACE("(%p,%p)\n", iface, param);
-    return ComponentInfo_GetDWORDValue(This->classkey, L"RequiresFullStream", (DWORD *)param);
+    return ComponentInfo_GetUINTValue(This->classkey, L"RequiresFullStream", (UINT *)param);
 }
 
 static HRESULT WINAPI MetadataReaderInfo_DoesSupportPadding(IWICMetadataReaderInfo *iface,
@@ -1690,7 +1691,7 @@ static HRESULT WINAPI MetadataReaderInfo_DoesSupportPadding(IWICMetadataReaderIn
 {
     MetadataReaderInfo *This = impl_from_IWICMetadataReaderInfo(iface);
     TRACE("(%p,%p)\n", iface, param);
-    return ComponentInfo_GetDWORDValue(This->classkey, L"SupportsPadding", (DWORD *)param);
+    return ComponentInfo_GetUINTValue(This->classkey, L"SupportsPadding", (UINT *)param);
 }
 
 static HRESULT WINAPI MetadataReaderInfo_DoesRequireFixedSize(IWICMetadataReaderInfo *iface,
@@ -1826,7 +1827,8 @@ static const IWICMetadataReaderInfoVtbl MetadataReaderInfo_Vtbl = {
 static void read_metadata_patterns(MetadataReaderInfo *info, GUID *container_guid,
                                    struct metadata_container *container)
 {
-    UINT pattern_count=0, patterns_size=0;
+    DWORD pattern_count=0;
+    UINT patterns_size=0;
     WCHAR subkeyname[11], guidkeyname[39];
     LONG res;
     HKEY containers_key, guid_key, patternkey;
diff --git a/dlls/windowscodecs/wincodecs_private.h b/dlls/windowscodecs/wincodecs_private.h
index 5fb7720781c..72227cf0cd2 100644
--- a/dlls/windowscodecs/wincodecs_private.h
+++ b/dlls/windowscodecs/wincodecs_private.h
@@ -265,7 +265,7 @@ struct decoder_info
 struct decoder_stat
 {
     DWORD flags;
-    DWORD frame_count;
+    UINT frame_count;
 };
 
 struct decoder_frame
@@ -361,7 +361,7 @@ struct encoder_frame
     UINT bpp;
     BOOL indexed;
     DOUBLE dpix, dpiy;
-    DWORD num_colors;
+    UINT num_colors;
     WICColor palette[256];
     /* encoder options */
     BOOL interlace;