diff --git a/filetype.cc b/filetype.cc
index 779be256..fc9e6a08 100644
--- a/filetype.cc
+++ b/filetype.cc
@@ -61,7 +61,8 @@ bool isNameOfSound( string const & name )
     endsWith( s, ".mpc" ) ||
     endsWith( s, ".wma" ) ||
     endsWith( s, ".wv" ) ||
-    endsWith( s, ".ape" );
+    endsWith( s, ".ape" ) ||
+    endsWith( s, ".spx" );
 }
 
 bool isNameOfPicture( string const & name )
diff --git a/mdictparser.cc b/mdictparser.cc
index 48f565f9..9ef1f2f2 100644
--- a/mdictparser.cc
+++ b/mdictparser.cc
@@ -247,13 +247,20 @@ bool MdictParser::parseCompressedBlock( size_t compressedBlockSize, const char *
   quint32 type;
   quint32 checksum;
   type = qFromBigEndian<quint32>( ( const uchar * ) compressedBlockPtr );
-  checksum = qFromBigEndian<quint32>( ( const uchar * )compressedBlockPtr + sizeof( type ) );
+  checksum = qFromBigEndian<quint32>( ( const uchar * )compressedBlockPtr + sizeof( quint32 ) );
 
   if ( type == 0x00000000 )
   {
     // No compression
-    checksum >>= 8;
-    if ( checksum !=  qFromBigEndian<quint16>( dataSize - 2 ) )
+    checksum &= 0xffff;
+    quint16 sum = 0;
+    for ( size_t i = 0; i < dataSize; i++ )
+    {
+      sum += dataPtr[i];
+    }
+    sum += 1;
+
+    if ( checksum != sum )
     {
       qWarning() << "MDict: parseCompressedBlock: plain: checksum not match";
       return false;
diff --git a/mdictparser.hh b/mdictparser.hh
index 2f03be8d..39df86da 100644
--- a/mdictparser.hh
+++ b/mdictparser.hh
@@ -66,7 +66,7 @@ public:
 
   enum
   {
-    kParserVersion = 0x000000b
+    kParserVersion = 0x000000c
   };
 
   struct RecordIndex