diff --git a/README.md b/README.md
index 22f12f2..619cdf1 100644
--- a/README.md
+++ b/README.md
@@ -8,8 +8,9 @@ A ROM patcher made in HTML5.
    * APS
    * BPS
    * RUP
-   * VCDiff (xdelta)
    * PPF
+   * Paper Mario Star Rod (.mod)
+   * VCDiff (.xdelta)
 * can patch and create patches
 * shows ROM CRC32, MD5 and SHA-1 before patching
 * can remove headers before patching
diff --git a/RomPatcher.js b/RomPatcher.js
index 3c83daf..73e187d 100644
--- a/RomPatcher.js
+++ b/RomPatcher.js
@@ -1,4 +1,4 @@
-/* Rom Patcher JS v20190531 - Marc Robledo 2016-2019 - http://www.marcrobledo.com/license */
+/* Rom Patcher JS v20200225 - Marc Robledo 2016-2020 - http://www.marcrobledo.com/license */
 const TOO_BIG_ROM_SIZE=67108863;
 const HEADERS_INFO=[
 	[/\.nes$/, 16, 1024], //interNES
@@ -199,7 +199,7 @@ addEvent(window,'load',function(){
 		translatableElements[i].innerHTML=_(translatableElements[i].dataset.localize);
 	}
 	
-	el('row-file-patch').title=_('compatible_formats')+' IPS, UPS, APS, BPS, RUP, PPF, xdelta';
+	el('row-file-patch').title=_('compatible_formats')+' IPS, UPS, APS, BPS, RUP, PPF, MOD (Paper Mario Star Rod), xdelta';
 	
 	el('input-file-rom').value='';
 	el('input-file-patch').value='';
@@ -411,6 +411,8 @@ function _readPatchFile(){
 			patch=parseRUPFile(patchFile);
 		}else if(header.startsWith(PPF_MAGIC)){
 			patch=parsePPFFile(patchFile);
+		}else if(header.startsWith(PMSR_MAGIC)){
+			patch=parseMODFile(patchFile);
 		}else if(header.startsWith(VCDIFF_MAGIC)){
 			patch=parseVCDIFF(patchFile);
 		}else{
diff --git a/_cache_service_worker.js b/_cache_service_worker.js
index 54b7c34..bf99faa 100644
--- a/_cache_service_worker.js
+++ b/_cache_service_worker.js
@@ -30,7 +30,7 @@ caches.keys().then(function(cacheNames){
 });
 
 var PRECACHE_ID='rom-patcher-js';
-var PRECACHE_VERSION='v7';
+var PRECACHE_VERSION='v7b';
 var PRECACHE_URLS=[
 	'/RomPatcher.js/','/RomPatcher.js/index.html',
 	'/RomPatcher.js/manifest.json',
@@ -56,6 +56,7 @@ var PRECACHE_URLS=[
 	'/RomPatcher.js/bps.js',
 	'/RomPatcher.js/rup.js',
 	'/RomPatcher.js/ppf.js',
+	'/RomPatcher.js/pmsr.js',
 	'/RomPatcher.js/vcdiff.js'
 ];
 
diff --git a/index.html b/index.html
index d33a217..2acbc5f 100644
--- a/index.html
+++ b/index.html
@@ -28,29 +28,32 @@
 	<script type="text/javascript" src="./bps.js"></script>
 	<script type="text/javascript" src="./rup.js"></script>
 	<script type="text/javascript" src="./ppf.js"></script>
+	<script type="text/javascript" src="./pmsr.js"></script>
 	<script type="text/javascript" src="./vcdiff.js"></script>
 	<script type="text/javascript" src="./libs/zip.js"></script>
 
 	<script type="text/javascript"><!--
+		/*
 		// PREDEFINED PATCHES EXAMPLE
 		// uncomment this to enable predefined patches, Rom Patcher JS will fetch patches hosted in your server
-		// format should be self explanatory
-		// you can add validation to patch files that have no validation (like IPS or xdelta) by providing a crc
-		// this object could be also dynamically generated by your server backend
-		/*var PREDEFINED_PATCHES=[
-			//zip includes various patches+every patch file inside specified separately (best method)
-			{patch:'./_example/SML2DXv181.zip#SML2DXv181.ips',name:'Super Mario Land 2 DX v1.8.1 (USA/Europe)',crc:0xd5ec24e4},
-			{patch:'./_example/SML2DXv181.zip#SML2DXv181_jap.ips',name:'Super Mario Land 2 DX v1.8.1 (Japan)',crc:0xa715daf5},
-
-			//zip includes various patches but no patch file inside specified, user will be able to choose the desired patch file in a popup (not recommended, also only a single crc for all patches could be provided)
-			{patch:'./_example/SML2DXv181.zip',name:'Super Mario Land 2 DX v1.8.1 (All regions)'},
-
+		// - format should be self explanatory
+		// - you can add provide crc for source files, allowing IPS to have validation!
+		// - this could be also dynamically generated by your server backend, allowing you to build your own patcher for your projects
+		var PREDEFINED_PATCHES=[
 			//zip includes a single patch (recommended)
 			{patch:'./_example/SONICDX.zip',name:'Sonic 3D Blast Director\'s Cut v1.1',crc:0x44a2ca44},
 
+			//if providing a zipped file, multiple patch files within it can be specified (recommended)
+			{patch:'./_example/SML2DXv181.zip#SML2DXv181.ips',name:'Super Mario Land 2 DX v1.8.1 (USA/Europe)',crc:0xd5ec24e4},
+			{patch:'./_example/SML2DXv181.zip#SML2DXv181_jap.ips',name:'Super Mario Land 2 DX v1.8.1 (Japan)',crc:0xa715daf5},
+
+			//if a patch file is not specified in a zipped file, user will be able to choose the desired patch file in a popup (not recommended, also only a single crc for all patches could be provided)
+			{patch:'./_example/SML2DXv181.zip',name:'Super Mario Land 2 DX v1.8.1 (All regions)'},
+
 			//uncompressed patch (not recommended because of bandwidth purposes)
 			{patch:'./_example/MarvelousATI_EN_v1.07.xdelta',name:'Marvelous (SFC) ENG Translation v1.07',crc:0xcedf3ba7}
-		];*/
+		];
+		*/
 	--></script>
 </head>
 <body><div id="column">
@@ -91,7 +94,7 @@
 		<div class="row" id="row-file-patch">
 			<div class="leftcol"><label for="input-file-patch" data-localize="patch_file">Patch file:</label></div>
 			<div class="rightcol">
-				<input type="file" id="input-file-patch" accept=".ips,.ups,.bps,.aps,.rup,.ppf,.xdelta,.zip"/>
+				<input type="file" id="input-file-patch" accept=".ips,.ups,.bps,.aps,.rup,.ppf,.mod,.xdelta,.zip"/>
 			</div>
 		</div>
 
@@ -146,7 +149,7 @@
 
 <!-- FOOTER -->
 <footer>
-	Rom Patcher JS <small>v2.1</small> by <a href="/">Marc Robledo</a>
+	Rom Patcher JS <small>v2.2</small> by <a href="/">Marc Robledo</a>
 	<br />
 	<i class="icon github"></i> <a href="https://github.com/marcrobledo/RomPatcher.js/" target="_blank">See on GitHub</a>
 	<i class="icon heart"></i> <a href="https://www.paypal.me/marcrobledo/5" target="_blank" rel="nofollow">Donate</a>
diff --git a/pmsr.js b/pmsr.js
new file mode 100644
index 0000000..e4ba2e5
--- /dev/null
+++ b/pmsr.js
@@ -0,0 +1,87 @@
+/* PMSR (Paper Mario Star Rod) module for Rom Patcher JS v20200225 - Marc Robledo 2020 - http://www.marcrobledo.com/license */
+/* File format specification: http://origami64.net/attachment.php?aid=790 (dead link) */
+
+const PMSR_MAGIC='PMSR';
+const YAY0_MAGIC='Yay0';
+const PAPER_MARIO_USA10_CRC32=0xa7f5cd7e;
+const PAPER_MARIO_USA10_FILE_SIZE=41943040;
+
+
+function PMSR(){
+	this.targetSize=0;
+	this.records=[];
+}
+PMSR.prototype.addRecord=function(offset, data){
+	this.records.push({offset:offset, data:data})
+}
+PMSR.prototype.toString=function(){
+	var s='Star Rod patch';
+	s+='\nTarget file size: '+this.targetSize;
+	s+='\n#Records: '+this.records.length;
+	return s;
+}
+
+
+PMSR.prototype.validateSource=function(romFile){
+	return romFile.fileSize===PAPER_MARIO_USA10_FILE_SIZE && crc32(romFile)===PAPER_MARIO_USA10_CRC32;
+}
+PMSR.prototype.apply=function(romFile, validate){
+	if(validate && !this.validateSource(romFile)){
+		throw new Error('error_crc_input');
+	}
+
+	console.log('a');
+	if(this.targetSize===romFile.fileSize){
+		tempFile=romFile.slice(0, romFile.fileSize);
+	}else{
+		tempFile=new MarcFile(this.targetSize);
+		romFile.copyToFile(tempFile,0);
+	}
+
+	console.log('b');
+	for(var i=0; i<this.records.length; i++){
+		tempFile.seek(this.records[i].offset);
+		tempFile.writeBytes(this.records[i].data);
+	}
+	
+	return tempFile;
+}
+
+function parseMODFile(file){
+	var patch=new PMSR();
+
+	/*file.seek(0);
+	if(file.readString(YAY0_MAGIC.length)===YAY0_MAGIC){
+		file=PMSR.YAY0_decode(file);
+	}*/
+
+	patch.targetSize=PAPER_MARIO_USA10_FILE_SIZE;
+
+	file.seek(4);
+	var nRecords=file.readU32();
+
+	for(var i=0; i<nRecords; i++){
+		var offset=file.readU32();
+		var length=file.readU32();
+		patch.addRecord(offset, file.readBytes(length));
+
+		if((offset+length)>patch.targetSize)
+			patch.targetSize=offset+length;
+	}
+
+	return patch;
+}
+
+
+
+
+
+/* to-do */
+//MOD.prototype.export=function(fileName){return null}
+//function createMODFromFiles(original, modified){return null}
+
+
+/* https://github.com/pho/WindViewer/wiki/Yaz0-and-Yay0 */
+PMSR.YAY0_decode=function(file){
+	/* to-do */
+}
\ No newline at end of file
diff --git a/ppf.js b/ppf.js
index cf919d9..fc4c741 100644
--- a/ppf.js
+++ b/ppf.js
@@ -1,4 +1,4 @@
-/* PPF module for Rom Patcher JS v20200221 - Marc Robledo 2019-2020 - http://www.marcrobledo.com/license */
+/* PPF module for Rom Patcher JS v20190401 - Marc Robledo 2019 - http://www.marcrobledo.com/license */
 /* File format specification: https://www.romhacking.net/utilities/353/  */
 
 
@@ -6,7 +6,6 @@
 const PPF_MAGIC='PPF';
 const PPF_IMAGETYPE_BIN=0x00;
 const PPF_IMAGETYPE_GI=0x01;
-const PPF_BEGIN_FILE_ID_DIZ_MAGIC='@BEG';//@BEGIN_FILE_ID.DIZ
 
 function PPF(){
 	this.version=3;
@@ -29,8 +28,6 @@ PPF.prototype.toString=function(){
 	s+='\nImage type: '+this.imageType;
 	s+='\nBlock check: '+!!this.blockCheck;
 	s+='\nUndo data: '+this.undoData;
-	if(this.fileIdDiz)
-		s+='\nFILE_ID.DIZ: '+this.fileIdDiz;
 	return s
 }
 PPF.prototype.export=function(fileName){
@@ -47,9 +44,6 @@ PPF.prototype.export=function(fileName){
 	if(this.blockCheck){
 		patchFileSize+=1024;
 	}
-	if(this.fileIdDiz){
-		patchFileSize+=18+this.fileIdDiz.length+16+4;
-	}
 
 	tempFile=new MarcFile(patchFileSize);
 	tempFile.fileName=fileName+'.ppf';
@@ -66,7 +60,11 @@ PPF.prototype.export=function(fileName){
 		tempFile.writeU8(0x00); //dummy
 
 	}else if(this.version===2){
-		tempFile.writeU32(this.inputFileSize);
+		//unknown data?
+		tempFile.writeU8(0x00);
+		tempFile.writeU8(0x00);
+		tempFile.writeU8(0x00);
+		tempFile.writeU8(0x00);
 	}
 
 	if(this.blockCheck){
@@ -78,26 +76,17 @@ PPF.prototype.export=function(fileName){
 	tempFile.littleEndian=true;
 	for(var i=0; i<this.records.length; i++){
 		tempFile.writeU32(this.records[i].offset & 0xffffffff);
-
-		if(this.version===3){
-			var offset2=this.records[i].offset;
-			for(var j=0; j<32; j++)
-				offset2=parseInt((offset2/2)>>>0);
-			tempFile.writeU32(offset2);
-		}
+		//tempFile.writeU32(0x00000000); //to-do: limited to 4GB right now
+		var offset2=this.records[i].offset;
+		for(var j=0; j<32; j++)
+			offset2=parseInt((offset2/2)>>>0);
+		tempFile.writeU32(offset2);
 		tempFile.writeU8(this.records[i].data.length);
 		tempFile.writeBytes(this.records[i].data);
 		if(this.undoData)
 			tempFile.writeBytes(this.records[i].undoData);
 	}
 
-	if(this.fileIdDiz){
-		tempFile.writeString('@BEGIN_FILE_ID.DIZ');
-		tempFile.writeString(this.fileIdDiz);
-		tempFile.writeString('@END_FILE_ID.DIZ');
-		tempFile.writeU16(this.fileIdDiz.length);
-		tempFile.writeU16(0x00);
-	}
 
 
 
@@ -175,27 +164,17 @@ function parsePPFFile(patchFile){
 		patchFile.skip(1);
 	}else if(patch.version===2){
 		patch.blockCheck=true;
-		patch.inputFileSize=patchFile.readU32();
+		patchFile.skip(4);
 	}
 
 	if(patch.blockCheck){
-		patch.blockCheck=patchFile.readBytes(1024);
+		patchFile.blockCheck=patchFile.readBytes(1024);
 	}
 
 
 
 	patchFile.littleEndian=true;
 	while(!patchFile.isEOF()){
-
-		if(patchFile.readString(4)===PPF_BEGIN_FILE_ID_DIZ_MAGIC){
-			patchFile.skip(14);
-			//console.log('found file_id.diz begin');
-			patch.fileIdDiz=patchFile.readString(3072);
-			patch.fileIdDiz=patch.fileIdDiz.substr(0, patch.fileIdDiz.indexOf('@END_FILE_ID.DIZ'));
-			break;
-		}
-		patchFile.skip(-4);
-
 		var offset;
 		if(patch.version===3){
 			var u64_1=patchFile.readU32();
diff --git a/predefined_patches_example.php b/predefined_patches_example.php
deleted file mode 100644
index 533d34c..0000000
--- a/predefined_patches_example.php
+++ /dev/null
@@ -1,29 +0,0 @@
-<?php
-/*
-	this template code should build a valid PREDEFINED_PATCHES object structure for Rom Patcher JS
-	it's intended for sites that host multiple patches (like www.romhacking.net)
-
-	note: this has not been tested!
-*/
-
-
-if(isset($_GET["patch"])){
-	$patchFile=$_GET["patch"];
-	if(isset($_GET["compressed"])){
-		$patchFile.="#".$_GET["compressed"];
-	}
-	if(isset($_GET["name"])){
-		$patchName=addslashes($_GET["name"]);
-	}else{
-		$patchName=$_GET["patch"];
-	}
-	
-	echo "var PREDEFINED_PATCHES=[";
-	echo "{patch:'".$patchFile."',name:'".$patchName."'";
-	if(isset($_GET["crc"]) && preg_match("/^[0-9a-f]{1,8}$/i", $_GET["crc"])){
-		echo ", crc:0x".$_GET["crc"];
-	}
-	echo "}";
-	echo "];";
-}
-?>
diff --git a/worker_apply.js b/worker_apply.js
index ee0dcce..4424287 100644
--- a/worker_apply.js
+++ b/worker_apply.js
@@ -9,6 +9,7 @@ self.importScripts(
 	'./bps.js',
 	'./rup.js',
 	'./ppf.js',
+	'./pmsr.js',
 	'./vcdiff.js'
 );
 
@@ -32,6 +33,8 @@ self.onmessage = event => { // listen for messages from the main thread
 		patch=parseRUPFile(patchFile);
 	}else if(header.startsWith(PPF_MAGIC)){
 		patch=parsePPFFile(patchFile);
+	}else if(header.startsWith(PMSR_MAGIC)){
+		patch=parseMODFile(patchFile);
 	}else if(header.startsWith(VCDIFF_MAGIC)){
 		patch=parseVCDIFF(patchFile);
 	}else{