diff --git a/src/read.rs b/src/read.rs
index 9f18bd00f..2685dd03e 100644
--- a/src/read.rs
+++ b/src/read.rs
@@ -138,6 +138,10 @@ pub trait SwfRead<R: Read> {
         self.get_inner().read_u32::<LittleEndian>()
     }
 
+    fn read_u64(&mut self) -> Result<u64> {
+        self.get_inner().read_u64::<LittleEndian>()
+    }
+
     fn read_i8(&mut self) -> Result<i8> {
         self.get_inner().read_i8()
     }
@@ -598,7 +602,7 @@ impl<R: Read> Reader<R> {
             Some(TagCode::RemoveObject2) => Tag::RemoveObject(tag_reader.read_remove_object_2()?),
 
             Some(TagCode::VideoFrame) => tag_reader.read_video_frame()?,
-
+            Some(TagCode::ProductInfo) => Tag::ProductInfo(tag_reader.read_product_info()?),
             _ => {
                 let size = length as usize;
                 let mut data = vec![0; size];
@@ -1936,7 +1940,11 @@ impl<R: Read> Reader<R> {
             action: PlaceObjectAction::Place(reader.read_u16()?),
             depth: reader.read_i16()?,
             matrix: Some(reader.read_matrix()?),
-            color_transform: if !reader.get_ref().is_empty() { Some(reader.read_color_transform_no_alpha()?) } else { None },
+            color_transform: if !reader.get_ref().is_empty() {
+                Some(reader.read_color_transform_no_alpha()?)
+            } else {
+                None
+            },
             ratio: None,
             name: None,
             clip_depth: None,
@@ -2674,6 +2682,19 @@ impl<R: Read> Reader<R> {
             data,
         })
     }
+
+    pub fn read_product_info(&mut self) -> Result<ProductInfo> {
+        // Not document in SWF19 reference.
+        // See http://wahlers.com.br/claus/blog/undocumented-swf-tags-written-by-mxmlc/
+        Ok(ProductInfo {
+            product_id: self.read_u32()?,
+            edition: self.read_u32()?,
+            major_version: self.read_u8()?,
+            minor_version: self.read_u8()?,
+            build_number: self.get_mut().read_u64::<LittleEndian>()?,
+            compilation_date: self.get_mut().read_u64::<LittleEndian>()?,
+        })
+    }
 }
 
 #[cfg(test)]
diff --git a/src/tag_code.rs b/src/tag_code.rs
index 7c79bd6eb..9cd7a06f1 100644
--- a/src/tag_code.rs
+++ b/src/tag_code.rs
@@ -42,6 +42,8 @@ pub enum TagCode {
 
     DefineSprite = 39,
 
+    ProductInfo = 41,
+    
     FrameLabel = 43,
 
     SoundStreamHead2 = 45,
diff --git a/src/types.rs b/src/types.rs
index dea6e4938..8e98aea46 100644
--- a/src/types.rs
+++ b/src/types.rs
@@ -538,6 +538,8 @@ pub enum Tag {
     FrameLabel(FrameLabel),
     DefineSceneAndFrameLabelData(DefineSceneAndFrameLabelData),
 
+    ProductInfo(ProductInfo),
+
     Unknown {
         tag_code: u16,
         data: Vec<u8>,
@@ -1087,3 +1089,16 @@ pub struct DoAbc {
 pub type DoAction = Vec<u8>;
 
 pub type JpegTables = Vec<u8>;
+
+/// `ProductInfo` contains information about the software used to generate the SWF.
+/// Not document in the SWF19 reference. Emitted by mxmlc.
+/// See http://wahlers.com.br/claus/blog/undocumented-swf-tags-written-by-mxmlc/
+#[derive(Clone, Debug, PartialEq, Eq)]
+pub struct ProductInfo {
+    pub product_id: u32,
+    pub edition: u32,
+    pub major_version: u8,
+    pub minor_version: u8,
+    pub build_number: u64,
+    pub compilation_date: u64,
+}
diff --git a/src/write.rs b/src/write.rs
index b6ebeb4c5..e6b2a5cbe 100644
--- a/src/write.rs
+++ b/src/write.rs
@@ -138,6 +138,10 @@ pub trait SwfWrite<W: Write> {
         self.get_inner().write_u32::<LittleEndian>(n)
     }
 
+    fn write_u64(&mut self, n: u64) -> Result<()> {
+        self.get_inner().write_u64::<LittleEndian>(n)
+    }
+
     fn write_i8(&mut self, n: i8) -> Result<()> {
         self.get_inner().write_i8(n)
     }
@@ -1039,6 +1043,7 @@ impl<W: Write> Writer<W> {
             }
 
             Tag::DefineSceneAndFrameLabelData(ref data) => self.write_define_scene_and_frame_label_data(data)?,
+            Tag::ProductInfo(ref product_info) => self.write_product_info(product_info)?,
 
             Tag::Unknown { tag_code, ref data } => {
                 self.write_tag_code_and_length(tag_code, data.len() as u32)?;
@@ -2660,6 +2665,17 @@ impl<W: Write> Writer<W> {
         Ok(())
     }
 
+    fn write_product_info(&mut self, product_info: &ProductInfo) -> Result<()> {
+        self.write_tag_header(TagCode::ProductInfo, 26)?;
+        self.write_u32(product_info.product_id)?;
+        self.write_u32(product_info.edition)?;
+        self.write_u8(product_info.major_version)?;
+        self.write_u8(product_info.minor_version)?;
+        self.write_u64(product_info.build_number)?;
+        self.write_u64(product_info.compilation_date)?;
+        Ok(())
+    }
+
     fn write_tag_header(&mut self, tag_code: TagCode, length: u32) -> Result<()> {
         self.write_tag_code_and_length(tag_code as u16, length)
     }