Some are classical extensions. Others are specific to Up ! Application System.
| Extension | Meaning |
| a | Static library for the Unix platform. |
| avi | Video to the Audio Video (AVI) format from Microsoft. |
| bat | Script of commands for the Windows platforms. |
| bmp | Picture to the Bitmap format from Microsoft. |
| c | Source of a C program. |
| cpp | Source of a C++ program. |
| clas class | Class of a Java module. |
| css | Styles sheet to the Cascading Style Sheet (CSS) format from World Wide Web Consortium (W3C). |
| csv | Exchange to the Comma Separated Value (CSV) format. |
| dll | Dynamic library for the Windows platforms. |
| idl | Interface Definition Language for the Corba or ActiveX objects. |
| e | Exportations of a source file of a C program. |
| edi | Exchange to the Electronic Data Interchange For Administration, Commerce and Transport (EDIFACT) format from United Nations. |
| exe | Executable for the Windows platforms. |
| gif | Picture to the Graphics Interchange Format (GIF) format CompuServe. |
| gz | Archive to the Gnu Zip format. |
| h | Header of a source file of a C program. |
| hh | Header of a source file of a C++ program. |
| html | Document to the Hyper Text Markup Language (HTML) format from World Wide Web Consortium (W3C). |
| idc | Exchange to the IDoc format from Sap. |
| ini | Initialization of a program. |
| jav java | Source of a Java program. |
| jpg jpeg | Picture to the Joint Photographic Experts Group (JPEG) format from Ibm. |
| lib | Static library for the Windows platforms. |
| log | Log tracing the activity of the program or a task. |
| map | Execution trace while activating the Debug parameter. |
| mp3 | Sound to the Mpeg Layer III (MP3) format. |
| mpg mpeg | Video to the Motion Jpeg (MPEG) format. |
| msg | Message to the Rfc 822 format. |
| nls | Linguistic resources for Up ! Natural Language support. |
| nlt | Thesaurus for Up ! Natural Language support. |
| pcl | Document to the Print Code Language (PCL) format from Hewlett Packard. |
| pcx | Picture to the Pcx format from ZSoft. |
| Document to the Portable Document Format (PDF) format from Adobe. | |
| pot | Model of document to the Power Point format from Microsoft. |
| ppt | Document to the Power Point format from Microsoft. |
| prf | Execution profile produced by Up ! Profiler. |
| ps | Document to the PostScript format from Adobe. |
| rtf | Document to the Rich Text Format (RTF) format from Microsoft. |
| so | Dynamic library for the Unix platforms. |
| tif tiff tff | Picture to the Tagged Image File Format (TIFF) format from Aldus. |
| txt | Document without a format. |
| uar | Archive to the Up ! Archive format. |
| uei | Data interchange of Up ! Electronic Data Interchange to the binary format. |
| ugn | Styles sheet of Up ! Graphical Engine to the binary format. |
| ulg | Log memorizing the modifications made into a persistent warehouse. |
| uml | Data intrchange of Up ! Mail Service to binary format. |
| uob | Directory of Up ! Object Request Broker to the binary format. |
| uof | Archive memorizing some objects of a persistent program. |
| upc | Vector-based picture of Up ! Picture to the binary format. |
| upi | Interface of a component or a module written in Up ! 5GL. |
| upl | Source of a component, a module or a resource written in Up ! 5GL. |
| usc | Security or licenses profile of Up ! Security Manager to the binary format. |
| uwf | Archive keeping the objects of a persistent warehouse managed by Up ! Object Management System. |
| usc | Security archive of Up ! Security Manager. |
| wav | Sound to the Wave format from Microsoft. |
| xls | Document to the Excel format from Microsoft. |
| xlt | Document model to the Excel format from Microsoft. |
| xml | Document or exchange to eXtended Markup Language (XML) format from World Wide Web Consortium (W3C). |
| zip | Archive to the Z Lib format. |