$fopen を使う感じかな。これだと Warning がツールによって表示されると思うけど。
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| integer fd; | |
| fd = $fopen("filename", "rb"); | |
| if (fd !== 0) begin | |
| $fclose(fd); | |
| // ファイルあり！ | |
| end |