| Number | IMPLIB Warning Message |
| IM4600 | line number too long; truncated to 512 characters |
| The given line in the module-definition (.DEF) file exceeded the limit on line length. IMPLIB ignored text after the first 512 characters. | |
| IM4601 | unrecognized option option; option ignored |
| The given option was not a valid IMPLIB option. IMPLIB used the rest of the command line to try to build an import library. |