#define fopen newfopen

and header for MINGW and MS VS

src/include/ngspice/ngspice.h

@@ -218,6 +218,13 @@ extern double x_atanh(double);
 #endif
 #endif
 
+#ifndef EXT_ASC
+#if defined(__MINGW__) || defined(_MSC_VER)
+#define fopen newfopen
+extern FILE *newfopen(char *fn, char* md);
+#endif
+#endif
+
 #if defined(__GNUC__)
 #define ATTRIBUTE_NORETURN __attribute__ ((noreturn))
 #elif defined(_MSC_VER)