diff --git a/tzx2wav.cpp b/tzx2wav.cpp
index 2bda290..9848b49 100644
--- a/tzx2wav.cpp
+++ b/tzx2wav.cpp
@@ -204,7 +204,7 @@ void PauseWave(unsigned int pause_ms)
 	// Waits for "pause" milliseconds
 
 	int p;
-	if ((!skippause) || (curr != (numblocks - 1)))
+	if (curr && ((!skippause) || (curr != (numblocks - 1))))
 	{
 		p = (unsigned int)((((float)pause_ms)*freq) / 1000.0);
 		PlayWave(p);
diff --git a/user_io.cpp b/user_io.cpp
index 1f81904..d246550 100644
--- a/user_io.cpp
+++ b/user_io.cpp
@@ -920,7 +920,7 @@ int user_io_file_tx(char* name, unsigned char index, char opensave, char mute)
 	spi8(0xff);
 	DisableFpga();
 
-	if (strlen(f.name) > 4 && !strcasecmp(f.name + strlen(f.name) - 4, ".tzx"))
+	if (strlen(f.name) > 4 && (!strcasecmp(f.name + strlen(f.name) - 4, ".tzx") || !strcasecmp(f.name + strlen(f.name) - 4, ".cdt")))
 	{
 		printf("Processing TZX...\n");