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You Don’t Have the Right Program
There are specific computer programs that are compatible with RDEF files, and you may not have one installed on your computer. The most common program is Geoworks UI resource file. Try installing this program and see if you can open the file. You can download this program from the developer's website, the Microsoft Store / Apple App Store, or popular download portals.
You’re Not Sure of the File Type
Knowing the file type can help you open RDEF files. Different file extensions can be associated with different types of files. Uncommon Files usually use the RDEF extension. You might have a program installed on your computer that is designed to open this type of file. A good first step is trying to open the file in that program.
If you don’t know what type of file the RDEF file is, finding this information is simple. Please follow the instructions below depending on the type of operating system you are using.
On a Windows Computer:
- Right-click the file icon.
- Select “Properties” from the drop-down menu.
- Find the file type listed under “Type of File”.
On a Mac:
- Right-click on the file icon.
- Select “More Info” from the drop-down menu.
- Look for the file type listed under “Kind”.
You Need Help From the Developer
If no programs will open the RDEF file, you can ask software developers for help. They know their software better than anyone, and they might be able to explain why you can’t open the file. See the chart below to find the developers for the most common programs used to open RDEF files.
| Software | Developer |
|---|---|
| Geoworks UI resource file | Unknown |
You Need a Universal File Viewer
A universal file viewer, like File Magic (Download), is a tool that you can use to open a file when no other program will work. They can open many different file types, depending on the format. However, some files are incompatible with universal file viewers and will only open in binary file format. If none of the other options listed work, try a universal file viewer to open your RDEF file.
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1File types that are unsupported can be opened in binary format.
