diff --git a/src/Misc.cpp b/src/Misc.cpp
index 511c3fabb..bd102bd00 100644
--- a/src/Misc.cpp
+++ b/src/Misc.cpp
@@ -351,183 +351,6 @@ vector2d v2d_new(float x, float y)
 	return result;
 }
 
-int register_extension()
-{
-#if defined(WIN)
-	int returnval;
-	LONG rresult;
-	HKEY newkey;
-	char *currentfilename = exe_name();
-	char *iconname = NULL;
-	char *opencommand = NULL;
-	//char AppDataPath[MAX_PATH];
-	char *AppDataPath = NULL;
-	iconname = (char*)malloc(strlen(currentfilename)+6);
-	sprintf(iconname, "%s,-102", currentfilename);
-	
-	//Create Roaming application data folder
-	/*if(!SUCCEEDED(SHGetFolderPath(NULL, CSIDL_APPDATA|CSIDL_FLAG_CREATE, NULL, 0, AppDataPath))) 
-	{
-		returnval = 0;
-		goto finalise;
-	}*/
-	
-	//AppDataPath = _getcwd(NULL, 0);
-
-	//Move Game executable into application data folder
-	//TODO: Implement
-	
-	opencommand = (char*)malloc(strlen(currentfilename)+53+strlen(AppDataPath));
-	/*if((strlen(AppDataPath)+strlen(APPDATA_SUBDIR "\\Powder Toy"))<MAX_PATH)
-	{
-		strappend(AppDataPath, APPDATA_SUBDIR);
-		_mkdir(AppDataPath);
-		strappend(AppDataPath, "\\Powder Toy");
-		_mkdir(AppDataPath);
-	} else {
-		returnval = 0;
-		goto finalise;
-	}*/
-	sprintf(opencommand, "\"%s\" open \"%%1\" ddir \"%s\"", currentfilename, AppDataPath);
-
-	//Create extension entry
-	rresult = RegCreateKeyEx(HKEY_CURRENT_USER, "Software\\Classes\\.cps", 0, 0, REG_OPTION_NON_VOLATILE, KEY_ALL_ACCESS, NULL, &newkey, NULL);
-	if (rresult != ERROR_SUCCESS) {
-		returnval = 0;
-		goto finalise;
-	}
-	rresult = RegSetValueEx(newkey, 0, 0, REG_SZ, (LPBYTE)"PowderToySave", strlen("PowderToySave")+1);
-	if (rresult != ERROR_SUCCESS) {
-		RegCloseKey(newkey);
-		returnval = 0;
-		goto finalise;
-	}
-	RegCloseKey(newkey);
-
-	rresult = RegCreateKeyEx(HKEY_CURRENT_USER, "Software\\Classes\\.stm", 0, 0, REG_OPTION_NON_VOLATILE, KEY_ALL_ACCESS, NULL, &newkey, NULL);
-	if (rresult != ERROR_SUCCESS) {
-		returnval = 0;
-		goto finalise;
-	}
-	rresult = RegSetValueEx(newkey, 0, 0, REG_SZ, (LPBYTE)"PowderToySave", strlen("PowderToySave")+1);
-	if (rresult != ERROR_SUCCESS) {
-		RegCloseKey(newkey);
-		returnval = 0;
-		goto finalise;
-	}
-	RegCloseKey(newkey);
-
-	//Create program entry
-	rresult = RegCreateKeyEx(HKEY_CURRENT_USER, "Software\\Classes\\PowderToySave", 0, 0, REG_OPTION_NON_VOLATILE, KEY_ALL_ACCESS, NULL, &newkey, NULL);
-	if (rresult != ERROR_SUCCESS) {
-		returnval = 0;
-		goto finalise;
-	}
-	rresult = RegSetValueEx(newkey, 0, 0, REG_SZ, (LPBYTE)"Powder Toy Save", strlen("Powder Toy Save")+1);
-	if (rresult != ERROR_SUCCESS) {
-		RegCloseKey(newkey);
-		returnval = 0;
-		goto finalise;
-	}
-	RegCloseKey(newkey);
-
-	//Set DefaultIcon
-	rresult = RegCreateKeyEx(HKEY_CURRENT_USER, "Software\\Classes\\PowderToySave\\DefaultIcon", 0, 0, REG_OPTION_NON_VOLATILE, KEY_ALL_ACCESS, NULL, &newkey, NULL);
-	if (rresult != ERROR_SUCCESS) {
-		returnval = 0;
-		goto finalise;
-	}
-	rresult = RegSetValueEx(newkey, 0, 0, REG_SZ, (LPBYTE)iconname, strlen(iconname)+1);
-	if (rresult != ERROR_SUCCESS) {
-		RegCloseKey(newkey);
-		returnval = 0;
-		goto finalise;
-	}
-	RegCloseKey(newkey);
-
-	//Set Launch command
-	rresult = RegCreateKeyEx(HKEY_CURRENT_USER, "Software\\Classes\\PowderToySave\\shell\\open\\command", 0, 0, REG_OPTION_NON_VOLATILE, KEY_ALL_ACCESS, NULL, &newkey, NULL);
-	if (rresult != ERROR_SUCCESS) {
-		returnval = 0;
-		goto finalise;
-	}
-	rresult = RegSetValueEx(newkey, 0, 0, REG_SZ, (LPBYTE)opencommand, strlen(opencommand)+1);
-	if (rresult != ERROR_SUCCESS) {
-		RegCloseKey(newkey);
-		returnval = 0;
-		goto finalise;
-	}
-	RegCloseKey(newkey);
-	
-	returnval = 1;
-	finalise:
-
-	free(iconname);
-	free(opencommand);
-	free(currentfilename);
-	
-	return returnval;
-#elif defined(LIN)
-	char *currentfilename = exe_name();
-	FILE *f;
-	const char *mimedata =
-"<?xml version=\"1.0\"?>\n"
-"	<mime-info xmlns='http://www.freedesktop.org/standards/shared-mime-info'>\n"
-"	<mime-type type=\"application/vnd.powdertoy.save\">\n"
-"		<comment>Powder Toy save</comment>\n"
-"		<glob pattern=\"*.cps\"/>\n"
-"		<glob pattern=\"*.stm\"/>\n"
-"	</mime-type>\n"
-"</mime-info>\n";
-	f = fopen("powdertoy-save.xml", "wb");
-	if (!f)
-		return 0;
-	fwrite(mimedata, 1, strlen(mimedata), f);
-	fclose(f);
-
-	const char *desktopfiledata_tmp =
-"[Desktop Entry]\n"
-"Type=Application\n"
-"Name=Powder Toy\n"
-"Comment=Physics sandbox game\n"
-"MimeType=application/vnd.powdertoy.save;\n"
-"NoDisplay=true\n";
-	char *desktopfiledata = (char *)malloc(strlen(desktopfiledata_tmp)+strlen(currentfilename)+100);
-	strcpy(desktopfiledata, desktopfiledata_tmp);
-	strappend(desktopfiledata, "Exec=");
-	strappend(desktopfiledata, currentfilename);
-	strappend(desktopfiledata, " open %f\n");
-	f = fopen("powdertoy-tpt.desktop", "wb");
-	if (!f)
-		return 0;
-	fwrite(desktopfiledata, 1, strlen(desktopfiledata), f);
-	fclose(f);
-	system("xdg-mime install powdertoy-save.xml");
-	system("xdg-desktop-menu install powdertoy-tpt.desktop");
-	f = fopen("powdertoy-save-32.png", "wb");
-	if (!f)
-		return 0;
-	fwrite(icon_doc_32_png, 1, sizeof(icon_doc_32_png), f);
-	fclose(f);
-	f = fopen("powdertoy-save-16.png", "wb");
-	if (!f)
-		return 0;
-	fwrite(icon_doc_16_png, 1, sizeof(icon_doc_16_png), f);
-	fclose(f);
-	system("xdg-icon-resource install --noupdate --context mimetypes --size 32 powdertoy-save-32.png application-vnd.powdertoy.save");
-	system("xdg-icon-resource install --noupdate --context mimetypes --size 16 powdertoy-save-16.png application-vnd.powdertoy.save");
-	system("xdg-icon-resource forceupdate");
-	system("xdg-mime default powdertoy-tpt.desktop application/vnd.powdertoy.save");
-	unlink("powdertoy-save-32.png");
-	unlink("powdertoy-save-16.png");
-	unlink("powdertoy-save.xml");
-	unlink("powdertoy-tpt.desktop");
-	return 1;
-#elif defined MACOSX
-	return 0;
-#endif
-}
-
 void HSV_to_RGB(int h,int s,int v,int *r,int *g,int *b)//convert 0-255(0-360 for H) HSV values to 0-255 RGB
 {
 	float hh, ss, vv, c, x;
diff --git a/src/Misc.h b/src/Misc.h
index 6bbbd3a05..418298f08 100644
--- a/src/Misc.h
+++ b/src/Misc.h
@@ -72,8 +72,6 @@ void *file_load(char *fn, int *size);
 
 extern char *clipboard_text;
 
-int register_extension();
-
 int cpu_check(void);
 
 void HSV_to_RGB(int h,int s,int v,int *r,int *g,int *b);