diff --git a/ntsys b/ntsys
index 16a9426..73d2a05 100755
Binary files a/ntsys and b/ntsys differ
diff --git a/ntsys.h b/ntsys.h
index 247e4ff..6e76e9b 100644
--- a/ntsys.h
+++ b/ntsys.h
@@ -26,6 +26,10 @@
 
 #define NTSYS_VERSION "1.0"
 
+#define NAME_OF_32_BITS_TYPE unsigned int
+#define NAME_OF_64_BITS_TYPE unsigned long int
+#define NAME_OF_16_BITS_TYPE unsigned short int
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -61,6 +65,10 @@ static void __help(void) {
     );
 }
 
+static int __exe_run(__e_byte_t* memory, unsigned int memorysize, unsigned long filesize, FILE* fp) {
+    return EXIT_SUCCESS;
+}
+
 int ntsys_api_call(char* filename) {
 
     /* File data */
@@ -105,14 +113,19 @@ int ntsys_api_call(char* filename) {
         ntsys_error("Header read error or digital signature is invalid!");
         return EXIT_FAILURE;
     }
-
-    /*
-     *  printf("Filesize: %d bytes\n", *((unsigned short int*)head.e_filesize));
-     *  printf("Memorysize: %d bytes\n", *((unsigned short int*)head.e_memorysize));
-     */
-
-    
-    return EXIT_SUCCESS;
+    unsigned long int filesize = 0;
+    switch (4) {
+        case sizeof(NAME_OF_64_BITS_TYPE): filesize = *((NAME_OF_64_BITS_TYPE*)head.e_filesize); break;
+        case sizeof(NAME_OF_32_BITS_TYPE): filesize = *((NAME_OF_32_BITS_TYPE*)head.e_filesize); break;
+        default:
+        ntsys_error("Unknown data type! You must recompile the program and specify a different type.");
+        return EXIT_FAILURE;
+    }
+    __e_byte_t* memory = malloc(*((NAME_OF_16_BITS_TYPE*)head.e_memorysize));
+    int stat = __exe_run(memory, (unsigned int)*((NAME_OF_16_BITS_TYPE*)head.e_memorysize), filesize, fp);
+    fclose(fp);
+    free(memory);
+    return stat;
 }
 
 int ntsys_compile_asm(char* in_file, char* out_file) {