EFM File Extension

EFM file icon
Electronic Fiction Manuscript Format

What is EFM file?

Full format name of files that use EFM extension is Electronic Fiction Manuscript Format. EFM files are supported by software applications available for devices running Mac OS. Files with EFM extension are categorized as Text Files files. The Text Files subset comprises 377 various file formats. EFM is by far the most used program for working with EFM files. On the official website of SourceForge.net developer not only will you find detailed information about theEFM software, but also about EFM and other supported file formats.

Programs which support EFM file extension

The following listing features EFM-compatible programs. Files with EFM suffix can be copied to any mobile device or system platform, but it may not be possible to open them properly on target system.

Programs that support EFM file


Updated: 03/25/2020

How to open file with EFM extension?

There can be multiple causes why you have problems with opening EFM files on given system. On the bright side, the most encountered issues pertaining to Electronic Fiction Manuscript Format files aren’t complex. In most cases they can be addressed swiftly and effectively without assistance from a specialist. The list below will guide you through the process of addressing the encountered problem.

Step 1. Get the EFM

Install software to open EFM file The most common reason for such problems is the lack of proper applications that supports EFM files installed on the system. The solution is straightforward, just download and install EFM. The full list of programs grouped by operating systems can be found above. One of the most risk-free method of downloading software is using links provided by official distributors. Visit EFM website and download the installer.

Step 2. Verify the you have the latest version of EFM

Update software that support file extension EFMIf the problems with opening EFM files still occur even after installing EFM, it is possible that you have an outdated version of the software. Check the developer’s website whether a newer version of EFM is available. Sometimes software developers introduce new formats in place of that already supports along with newer versions of their applications. The reason that EFM cannot handle files with EFM may be that the software is outdated. The most recent version of EFM is backward compatible and can handle file formats supported by older versions of the software.

Step 3. Set the default application to open EFM files to EFM

After installing EFM (the most recent version) make sure that it is set as the default application to open EFM files. The method is quite simple and varies little across operating systems.

Associate software with EFM file on Windows

Change the default application in Windows

  • Right-click the EFM file and choose Open with option
  • Select Choose another app → More apps
  • Finally select Look for another app on this PC, point to the folder where EFM is installed, check the Always use this app to open EFM files box and conform your selection by clicking OK button
Associate software with EFM file on Mac

Change the default application in Mac OS

  • From the drop-down menu, accessed by clicking the file with EFM extension, select Information
  • Open the Open with section by clicking its name
  • From the list choose the appropriate program and confirm by clicking Change for all....
  • Finally, a This change will be applied to all files with EFM extension message should pop-up. Click Continue button in order to confirm your choice.

Step 4. Verify that the EFM is not faulty

You closely followed the steps listed in points 1-3, but the problem is still present? You should check whether the file is a proper EFM file. It is probable that the file is corrupted and thus cannot be accessed.

Check EFM file for viruses
1. Verify that the EFM in question is not infected with a computer virus

If the file is infected, the malware that resides in the EFM file hinders attempts to open it. It is advised to scan the system for viruses and malware as soon as possible or use an online antivirus scanner. If the scanner detected that the EFM file is unsafe, proceed as instructed by the antivirus program to neutralize the threat.

2. Ensure the file with EFM extension is complete and error-free

Did you receive the EFM file in question from a different person? Ask him/her to send it one more time. During the copy process of the file errors may occurred rendering the file incomplete or corrupted. This could be the source of encountered problems with the file. It could happen the the download process of file with EFM extension was interrupted and the file data is defective. Download the file again from the same source.

3. Verify whether your account has administrative rights

There is a possibility that the file in question can only be accessed by users with sufficient system privileges. Log out of your current account and log in to an account with sufficient access privileges. Then open the Electronic Fiction Manuscript Format file.

4. Verify that your device fulfills the requirements to be able to open EFM

The operating systems may note enough free resources to run the application that support EFM files. Close all running programs and try opening the EFM file.

5. Verify that your operating system and drivers are up to date

Up-to-date system and drivers not only makes your computer more secure, but also may solve problems with Electronic Fiction Manuscript Format file. It may be the case that the EFM files work properly with updated software that addresses some system bugs.

Do you want to help?

If you have additional information about the EFM file, we will be grateful if you share it with our users. To do this, use the form here and send us your information on EFM file.

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