diff --git a/RomPatcher.js b/RomPatcher.js
index 2c00313..7df5143 100644
--- a/RomPatcher.js
+++ b/RomPatcher.js
@@ -1,5 +1,9 @@
-/* RomPatcher.js v20180511 - Marc Robledo 2016-2018 - http://www.marcrobledo.com/license */
+/* RomPatcher.js v20180920 - Marc Robledo 2016-2018 - http://www.marcrobledo.com/license */
 var MAX_ROM_SIZE=33554432;
+var MORE_SNES_SIZES_HEADERLESS=[786432,1310720,1572864,2621440,3145728,5242880,6291456];
+
+
+
 var romFile, headeredRomFile, unheaderedRomFile, patch, romFile1, romFile2, tempFile;
 /* Shortcuts */
 function addEvent(e,ev,f){e.addEventListener(ev,f,false)}
@@ -29,10 +33,10 @@ addEvent(window,'load',function(){
 			unheaderedRomFile=null;
 			headeredRomFile=null;
 
-			if(isSnesRom(romFile.fileName) && isPowerOfTwo(romFile.fileSize)){
+			if(isSNESHeaderless(romFile)){
 				el('row-addheader').style.display='flex';
 				el('row-removeheader').style.display='none';
-			}else if(isSnesRom(romFile.fileName) && isHeadered(romFile.fileSize, 512)){
+			}else if(isSNESHeadered(romFile)){
 				el('row-addheader').style.display='none';
 				el('row-removeheader').style.display='flex';
 			}else{
@@ -91,9 +95,10 @@ addEvent(window,'load',function(){
 	//setTab(1);
 });
 
-function isSnesRom(fileName){return /\.(smc|sfc|fig|swc)$/.test(fileName)}
-function isPowerOfTwo(fileSize){return (fileSize & (fileSize-1))===0}
-function isHeadered(fileSize,headerSize){return isPowerOfTwo(fileSize-headerSize)}
+function isPowerOfTwo(romFile){return romFile.fileSize && (romFile.fileSize & (romFile.fileSize-1))===0}
+function isSNESExtension(romFile){return /\.(smc|sfc|fig|swc)$/.test(romFile.fileName)}
+function isSNESHeaderless(romFile){return isSNESExtension(romFile) && (isPowerOfTwo(romFile) || MORE_SNES_SIZES_HEADERLESS.indexOf(romFile.fileSize)>=0)}
+function isSNESHeadered(romFile){return isSNESExtension(romFile) && (isPowerOfTwo(romFile.fileSize-512) || MORE_SNES_SIZES_HEADERLESS.indexOf(romFile.fileSize-512)>=0)}
 
 
 function updateChecksums(file){
@@ -127,8 +132,8 @@ function _readPatchFile(){
 		patch=readAPSFile(tempFile);
 	}else if(tempFile.readString(0,4)===BPS_MAGIC){
 		patch=readBPSFile(tempFile);
-	}/*else if(tempFile.readString(0,4)===APSGBA_MAGIC){
-		patch=readAPSGBAFile(tempFile);
+	}/*else if(tempFile.readInt(0)===XDELTA_MAGIC){
+		patch=readXDeltaFile(tempFile);
 	}*/else {
 		MarcDialogs.alert('Invalid IPS/UPS/APS/BPS file');
 	}
diff --git a/_cache_service_worker.js b/_cache_service_worker.js
index f46cbdf..a495928 100644
--- a/_cache_service_worker.js
+++ b/_cache_service_worker.js
@@ -12,7 +12,7 @@ limitations under the License.
 mod by marcrobledo, original from: https://github.com/GoogleChrome/samples/blob/gh-pages/service-worker/basic/service-worker.js
 */
 
-const PRECACHE_ID='v20180919';
+const PRECACHE_ID='v20180920';
 const PRECACHE_FILES=[
 'index.html','./',
 'RomPatcher.css',
diff --git a/index.html b/index.html
index dfd4ae3..51535c9 100644
--- a/index.html
+++ b/index.html
@@ -103,7 +103,7 @@
 
 <!-- FOOTER -->
 <footer>
-	Rom Patcher JS <small>rev20180919</small> by <a href="/">Marc Robledo</a>
+	Rom Patcher JS <small>rev20180920</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>