Index: trunk/src_plugins/import_tinycad/tinycad.c
===================================================================
--- trunk/src_plugins/import_tinycad/tinycad.c	(revision 29519)
+++ trunk/src_plugins/import_tinycad/tinycad.c	(revision 29520)
@@ -198,9 +198,35 @@
 
 static int tinycad_support_prio(pcb_plug_import_t *ctx, unsigned int aspects, const char **args, int numargs)
 {
-	if (aspects != IMPORT_ASPECT_NETLIST)
-		return 0; /* only pure netlist import is supported */
-	return 20;
+	FILE *f;
+	unsigned int good = 0;
+
+	if ((aspects != IMPORT_ASPECT_NETLIST) || (numargs != 1))
+		return 0; /* only pure netlist import is supported from a single file*/
+
+	f = pcb_fopen(&PCB->hidlib, args[0], "r");
+	if (f == NULL)
+		return 0;
+
+	while(!feof(f)) {
+		char *s, line[1024];
+		s = fgets(line, sizeof(line), f);
+		while(isspace(*s)) s++;
+		if (strncmp(s, "COMPONENT", 9) == 0)
+			good |= 1;
+		else if (strncmp(s, "OPTION", 6) == 0)
+			good |= 2;
+		else if (strncmp(s, "NET", 3) == 0)
+			good |= 4;
+		if (good == (1|2|4)) {
+			fclose(f);
+			return 100;
+		}
+	}
+
+	fclose(f);
+
+	return 0;
 }