Index: src_plugins/dialogs/dlg_library_param.c
===================================================================
--- src_plugins/dialogs/dlg_library_param.c	(revision 29152)
+++ src_plugins/dialogs/dlg_library_param.c	(revision 29153)
@@ -512,7 +512,17 @@
 	FILE *f;
 	char *cmd;
 
+#ifdef __WIN32__
+	{
+		char *s;
+		cmd = pcb_strdup_printf("%s/sh -c \"%s --help\"", pcb_w32_bindir, l->data.fp.loc_info);
+		for(s = cmd; *s != '\0'; s++)
+			if (*s == '\\')
+				*s = '/';
+	}
+#else
 	cmd = pcb_strdup_printf("%s --help", l->data.fp.loc_info);
+#endif
 	f = pcb_popen(NULL, cmd, "r");
 	free(cmd);
 	if (f == NULL) {