diff --git a/engines/private/decompiler.cpp b/engines/private/decompiler.cpp
new file mode 100644
index 00000000000..66824686c88
--- /dev/null
+++ b/engines/private/decompiler.cpp
@@ -0,0 +1,66 @@
+#include <fstream>
+#include <sstream>
+#include "decompiler.h"
+
+namespace Private {
+
+Decompiler::~Decompiler() {
+}
+
+Decompiler::Decompiler(const std::string &fileName, bool mac) {
+	std::ifstream infile(fileName);
+	if (!infile.good())
+		throw std::invalid_argument("File does not exist");
+	std::ifstream input(fileName, std::ios::binary);
+	std::vector<unsigned char> buffer(std::istreambuf_iterator<char>(input), {});
+	decompile(buffer, mac);
+}
+Decompiler::Decompiler(std::vector<unsigned char> &buffer, bool mac) {
+	decompile(buffer, mac);
+}
+
+void Decompiler::decompile(std::vector<unsigned char> &buffer, bool mac) {
+	std::vector<unsigned char>::iterator it = buffer.begin();
+
+	std::string firstBytes(it, it + kHeader.length());
+	if (firstBytes != kHeader) {
+		throw std::invalid_argument("Not a precompiled game matrix");
+	}
+
+	std::stringstream ss;
+	bool inDefineRects = false;
+	for (it += kHeader.length() ; it != buffer.end() ; ) {
+		unsigned char byte = *it++;
+		if (byte == kCodeString) {
+			unsigned char len = *it++;
+			std::string s(it,it+len);
+			it += len;
+			ss << "\"" << s << "\"";
+		} else if (byte == kCodeShortLiteral || byte == kCodeShortId) {
+			unsigned char b1 = *it++;
+			unsigned char b2 = *it++;
+			unsigned int number = mac ? b2 + (b1 << 8) : b1 + (b2 << 8);
+			if (byte == kCodeShortId) ss << "k";
+			ss << number;
+		} else if (byte == kCodeRect && inDefineRects) {
+			ss << "RECT"; // override CRect
+		} else if (byte <= kCodeShortId && kCodeTable[byte].length() > 0) {
+			ss << kCodeTable[byte];
+		} else {
+			throw std::invalid_argument("Unknown byte code");
+		}
+
+		if (byte == kCodeRects) {
+			inDefineRects = true;
+		} else if (byte == kCodeBraceClose && inDefineRects) {
+			inDefineRects = false;
+		}
+	}
+	_result = ss.str();
+}
+
+void Decompiler::getResult(std::string &result) const {
+	result = _result;
+}
+
+}
diff --git a/engines/private/decompiler.h b/engines/private/decompiler.h
new file mode 100644
index 00000000000..4d8796f07db
--- /dev/null
+++ b/engines/private/decompiler.h
@@ -0,0 +1,109 @@
+#include <vector>
+#include <string>
+
+namespace Private {
+
+const std::string kHeader("Precompiled Game Matrix");
+
+const unsigned char kCodeString = 0x01;
+const unsigned char kCodeShortLiteral = 0x02;
+const unsigned char kCodeBraceClose = 0x04;
+const unsigned char kCodeRect = 0x2e;
+const unsigned char kCodeRects = 0x4f;
+const unsigned char kCodeShortId = 0x50;
+
+const std::vector<std::string> kCodeTable = {"",        //
+					     "",        // 0x01  (string)
+					     "",        // 0x02  (short literal)
+					     " {\n",    // 0x03
+					     "}\n",     // 0x04
+					     "(",       // 0x05
+					     ")",       // 0x06
+					     "",        //
+					     "",        //
+					     "",        //
+					     ",",       // 0x0a
+					     "",        //
+					     "%",       // 0x0c
+					     "",        //
+					     ";\n",     // 0x0e
+					     "!",       // 0x0f
+					     "-",       // 0x10
+					     "+",       // 0x11
+					     "=",       // 0x12
+					     ">",       // 0x13
+					     "<",       // 0x14
+					     "if ",     // 0x15
+					     "else ",   // 0x16
+					     "Exit",    // 0x17
+					     "goto",    // 0x18
+					     "Mask",    // 0x19
+					     "MaskDrawn",           // 0x1a
+					     "Movie",               // 0x1b
+					     "Transition",          // 0x1c
+					     "ThumbnailMovie",      // 0x1d
+					     "BustMovie",           // 0x1e
+					     "ViewScreen",          // 0x1f
+					     "VSPicture",           // 0x20
+					     "Bitmap",              // 0x21
+					     "Timer",               // 0x22
+					     "SoundArea",           // 0x23
+					     "Sound",               // 0x24
+					     "SoundEffect",         // 0x25
+					     "SyncSound",           // 0x26
+					     "LoopedSound",         // 0x27
+					     "NoStopSounds",        // 0x28
+					     "Resume",              // 0x29
+					     "Inventory",           // 0x2a
+					     "SetFlag",             // 0x2b
+					     "ChgMode",             // 0x2c
+					     "PoliceBust",          // 0x2d
+					     "CRect",               // 0x2e   overridden with "RECT" if in "define rects" block
+					     "",                    //
+					     "Random",              // 0x30
+					     "SafeDigit",           // 0x31
+					     "LoseInventory",       // 0x32
+					     "",                    //
+					     "PaperShuffleSound",   // 0x34
+					     "Quit",                // 0x35
+					     "DossierAdd",          // 0x36
+					     "DossierBitmap",       // 0x37
+					     "DossierPrevSuspect",  // 0x38
+					     "DossierNextSuspect",  // 0x39
+					     "DossierChgSheet",     // 0x3a
+					     "DiaryLocList",        // 0x3b
+					     "DiaryPage",           // 0x3c
+					     "DiaryInvList",        // 0x3d
+					     "DiaryPageTurn",       // 0x3e
+					     "DiaryGoLoc",          // 0x3f
+					     "SaveGame",            // 0x40
+					     "LoadGame",            // 0x41
+					     "RestartGame",         // 0x42
+					     "AskSave",             // 0x43
+					     "SetModifiedFlag",     // 0x44
+					     "PhoneClip",           // 0x45
+					     "PoliceClip",          // 0x46
+					     "AMRadioClip",         // 0x47
+					     "\nsetting ",          // 0x48
+					     "debug ",              // 0x49
+					     "\ndefine ",           // 0x4a
+					     "",                    //
+					     "variables",           // 0x4c
+					     "",                    //
+					     "",                    //
+					     "rects",               // 0x4f
+					     ""};                   // 0x50  (short id)
+
+
+class Decompiler {
+public:
+	Decompiler(const std::string &filename, bool mac = false);
+	Decompiler(std::vector<unsigned char> &buffer, bool mac = false);
+	virtual ~Decompiler();
+	void getResult(std::string &result) const;
+private:
+	void decompile(std::vector<unsigned char> &buffer, bool mac);
+	std::string _result;
+};
+
+}