diff --git a/main.cpp b/main.cpp
index 66bdaae..b1e88fb 100644
--- a/main.cpp
+++ b/main.cpp
@@ -39,20 +39,30 @@ unsigned char input_data_out() {
 
 int main(int argc, char** argv) {
 
-	vm_init("test.bas");
+	// Inicialitzar la mįquina virtual (li arriba el arxiu amb el programa per linea de comandos)
+	vm_init(argc < 2 ? nullptr : argv[1]); // "test.bas"
+
+	// Inicialitzar el procesador grąfic
 	vdp_init();
+
+	// Registrar els ports d'entrada i eixida del procesador grąfic
 	vm_register_out_port(10, vdp_data_out);
 	vm_register_out_port(11, vdp_cmd_out);
 	vm_register_in_port(12, vdp_in);
 
+	// Registrar els ports d'entrada i eixida del dispositiu d'entrada (teclat, en cas del emu)
 	vm_register_out_port(20, input_data_in);
 	vm_register_in_port(21, input_data_out);
 
+	// Inicialitzar el procesador de só
 	sound_init();
+
+	// Registrar els ports d'entrada i eixida del procesador de só
 	vm_register_out_port(30, sound_data_out);
 	vm_register_out_port(31, sound_cmd_out);
 	vm_register_in_port(32, sound_in);
 
+	// Inicialitzem el depurador del emulador
 	debug_init(vm_get_memory());
 	const bool* breakpoints = debug_get_breakpoints();
 
diff --git a/paco.vcxproj b/paco.vcxproj
index 16cb48d..524f553 100644
--- a/paco.vcxproj
+++ b/paco.vcxproj
@@ -46,6 +46,8 @@
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
     <LinkIncremental>false</LinkIncremental>
+    <IncludePath>C:\dev\lib\sdl2\include;$(IncludePath)</IncludePath>
+    <LibraryPath>C:\dev\lib\sdl2\lib\x86;$(LibraryPath)</LibraryPath>
   </PropertyGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
     <ClCompile>
@@ -76,6 +78,7 @@
       <GenerateDebugInformation>true</GenerateDebugInformation>
       <EnableCOMDATFolding>true</EnableCOMDATFolding>
       <OptimizeReferences>true</OptimizeReferences>
+      <AdditionalDependencies>SDL2.lib;SDL2main.lib;%(AdditionalDependencies)</AdditionalDependencies>
     </Link>
   </ItemDefinitionGroup>
   <ItemGroup>
diff --git a/vm.cpp b/vm.cpp
index dafb43e..a103ec1 100644
--- a/vm.cpp
+++ b/vm.cpp
@@ -48,28 +48,33 @@ static void load_rom() {
 }
 
 static void load_program(const char* filename) {
-	FILE *f = fopen(filename, "rb");
-	fseek(f, 0, SEEK_END);
-	long fsize = ftell(f);
-	fseek(f, 0, SEEK_SET);  //same as rewind(f);
-	char *program = (char*)malloc(fsize + 1);
-	fread(program, fsize, 1, f);
-	fclose(f);
-	program[fsize] = 0;
+	if (filename == nullptr) {
+		error_raise("No file specified");
+	} else {
+		FILE *f = fopen(filename, "rb");
+		if (f == nullptr) {
+			error_raise("File not found");
+		} else {
+			fseek(f, 0, SEEK_END);
+			long fsize = ftell(f);
+			fseek(f, 0, SEEK_SET);  //same as rewind(f);
+			char *program = (char*)malloc(fsize + 1);
+			fread(program, fsize, 1, f);
+			fclose(f);
+			program[fsize] = 0;
 
-	register_constants();
+			register_constants();
 
-	parser_parse(program, mem);
-	free(program);
+			parser_parse(program, mem);
+			free(program);
+		}
+	}
 
 	if (error_raised()) {
         vm_pc = 0xA000;
-		//error_print(&mem[0xA000]);
-	}
-	else {
+	} else {
 		printf("Compilation complete!\nProgram size: %d bytes\nMemory usage: %d bytes\n", parser_get_codesize(), parser_get_memory_usage());
 		/*FILE *f = fopen("test.bin", "wb");
-		if (f == nullptr) perror("Error");// printf("Error: %d (%s)\n", errno, strerror(errno));
 		fwrite(rawCode, parser_get_codesize(), 1, f);
 		fclose(f);*/
 	}