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Issue: You Can't Open CER Files
You might've double-clicked on the file, to be greeted with the "Choose a program to open the file" message. In some cases, you might be able to open the file, but the contents may seem garbled and that's because it was written to be opened in a specific program. Of course, you can't open a CER file with just any software. Not to worry - we have you covered!
Step 1: Find Out Which Software Uses CER Files
Opening your CER file starts with understanding which software uses a CER extension. In many cases, different types of software may use the same file extensions, also known as file associations.
Cerius2, Sierra Print Artist Certificate, and Creatacard Certificate Project are the most popular software packages that use CER files. Therefore, your best bet would be to download one of these software packages and use one of them to open your file.
Zipped files tend to require special handling and may require password access. Contact the file owner or the person who gave you the file for the password and unzip the file before attempting to open the contents.
Step 2: Learning More About CER "File Type"
If you can't download Cerius2, Sierra Print Artist Certificate, or Creatacard Certificate Project software, or if they don't work to open your CER file, you may be able to use the file type as a clue to finding out how you can open it. Using a Windows PC, you can right-click and navigate to "Properties" and then to "Type of file". On a Mac, select "More info" and "Kind".
Most likely, you will find that CER files are considered Web Files. Because many programs packages utilize Web Files, you might be able to find a program on your computer that handles those types of files.
If that still does not work, you may have to contact the associated software developer to find out how to open it. Unless you know the specific developer, you could contact one of these developers for assistance.
Please see our chart below of software titles and their developers:
| Software | Developer |
|---|---|
| Cerius2 | Accelrys Software Inc. |
| Sierra Print Artist Certificate | Windows Software |
| Creatacard Certificate Project | Broderbund |
| Lahey Fortran Compilation Error Messages | Unknown |
| Internet Security Certificate File | Windows Software |
| MSI Cerius II Chemical Format File | Accelrys Software Inc. |
Solution: Use File Magic to Open Your CER File
Although some files must be opened in binary file format (ie. in the program or device for which it was developed), you might be able to open it with a universal software viewer. Depending on the exact file format, you could use a universal software viewer such as File Magic [download] to open your CER file. Download File Magic today to open your CER files and hundreds of other file types with one program.
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1File types that are unsupported can be opened in binary format.
