The following describe the maximum limits of the IRE:
| Maximum Symbols | 10,208 |
| Maximum Controls | 1,264 |
| Maximum Window/dialogs | 1,008 |
| Maximum Resource Script File Lines | 24,576 |
| Maximum strings/messages | 2,032 |
| Maximum resources (such as bitmaps) | 2,032 |
| Maximum association items | 512 |
| Maximum Pre-design windows or dialog boxes | 512 |
| Maximum PMCX or temporary controls | unlimited |