diff --git a/filer.h b/filer.h
index 7b99e3b..1cbc8a0 100644
--- a/filer.h
+++ b/filer.h
@@ -1,7 +1,7 @@
 #ifndef __FILER_H__
 #define __FILER_H__
 
-class filer: public serialio {
+class filer: virtual public serialio {
 public:
 	virtual const char *advance() =0;
 	virtual const char *rewind() =0;
diff --git a/flash_filer.cpp b/flash_filer.cpp
index aafb140..d93d328 100644
--- a/flash_filer.cpp
+++ b/flash_filer.cpp
@@ -12,17 +12,18 @@
 #include "filer.h"
 #include "flash_filer.h"
 
+static File files[MAX_FILES];
+
 #if defined(USE_SPIFFS)
-static File file, dir;
+static File dir;
 #elif defined(USE_LITTLEFS)
-static File file;
 static Dir dir;
 #endif
 
-bool flash_filer::seek(uint32_t pos)
+bool flash_file::seek(uint32_t pos)
 {
 #if defined(USE_SPIFFS) || defined(USE_LITTLEFS)
-	return file.seek(pos);
+	return files[_fd].seek(pos);
 #else
 	return false;
 #endif
@@ -44,43 +45,44 @@ bool flash_filer::start()
 void flash_filer::stop()
 {
 #if defined(USE_SPIFFS) || defined(USE_LITTLEFS)
-	file.close();
+	for (int i = 0; i < MAX_FILES; i++)
+		files[i].close();
 #endif
 }
 
-bool flash_filer::more()
+bool flash_file::more()
 {
 #if defined(USE_SPIFFS) || defined(USE_LITTLEFS)
-	return file.available() > 0;
+	return files[_fd].available() > 0;
 #else
 	return false;
 #endif
 }
 
-uint8_t flash_filer::read() {
+uint8_t flash_file::read() {
 #if defined(USE_SPIFFS) || defined(USE_LITTLEFS)
-	return file.read();
+	return files[_fd].read();
 #else
 	return 0xff;
 #endif
 }
 
-void flash_filer::write(uint8_t b) {
+void flash_file::write(uint8_t b) {
 #if defined(USE_SPIFFS) || defined(USE_LITTLEFS)
-	file.write(b);
-	file.flush();
+	files[_fd].write(b);
+	files[_fd].flush();
 #endif
 }
 
 const char *flash_filer::advance() {
 #if defined(USE_SPIFFS) || defined(USE_LITTLEFS)
 	bool rewound = false;
-	file.close();
+	files[_current].close();
 #if defined(USE_LITTLEFS)
 	static char buf[32];
 	while (true) {
 		if (dir.next()) {
-			file = dir.openFile("r+");
+			files[_current] = dir.openFile("r+");
 			break;
 		}
 		dir = LittleFS.openDir(_programs);
@@ -89,10 +91,10 @@ const char *flash_filer::advance() {
 	return buf;
 #else
 	while (true) {
-		file = dir.openNextFile();
-		if (file) {
-			if (file.isDirectory())
-				file.close();
+		files[_current] = dir.openNextFile();
+		if (files[_current]) {
+			if (files[_current].isDirectory())
+				files[_current].close();
 			else
 				break;
 		} else if (!rewound) {
@@ -101,7 +103,7 @@ const char *flash_filer::advance() {
 		} else
 			return 0;
 	}
-	return file.name();
+	return files[_current].name();
 #endif
 #else
 	return 0;
diff --git a/flash_filer.h b/flash_filer.h
index 956a9d1..8af42e7 100644
--- a/flash_filer.h
+++ b/flash_filer.h
@@ -1,7 +1,23 @@
 #ifndef __FLASH_FILER_H__
 #define __FLASH_FILER_H__
 
-class flash_filer: public filer {
+#define MAX_FILES	3
+
+class flash_file: virtual public serialio {
+public:
+	flash_file(uint8_t fd = 0): _fd(fd) {}
+
+	virtual bool more();
+	virtual uint8_t read();
+	virtual void write(uint8_t);
+
+	bool seek(uint32_t pos);
+
+private:
+	const uint8_t _fd;
+};
+
+class flash_filer: public filer, public flash_file {
 public:
 	flash_filer(const char *programs): _programs(programs) {}
 
@@ -13,13 +29,11 @@ public:
 
 	bool start();
 	void stop();
-	bool seek(uint32_t pos);
-	
-	bool more();
-	uint8_t read();
-	void write(uint8_t);
+
+	void select(uint8_t f) { _current = f; }
 
 private:
 	const char *_programs;
+	uint8_t _current;
 };
 #endif