What is an ER file?
An .ER file can belong to several different software applications. The most common use is related to video games. It is often a Nintendo Wii audio stream or level data file. Fans and modders use these files to modify games. Specifically, the Newer Team uses the .ER format for Newer Super Mario Bros. Wii Audio files.
Another popular use for .ER files is database design. Tools like ERDPlus, ERMaster, and ER Assistant save Entity-Relationship diagrams as .ER files. Some of these diagram files use standard JSON formatting to store the shapes and connections.
Finally, an .ER file can be a system report. The Eurocommand ENAio software uses .ER files for command and control system reports, which are often structured as encrypted ZIP archives. NI DITMCO TestExecutive software also generates test report files using the .ER extension.
How to open ER files?
Because the .ER extension has multiple meanings, you must identify the file type before you open it.
- For game modding files, you need specialized Wii audio tools or level editors.
- For diagram files, you can open them in the original software. If it is an ERDPlus project, you can open it in a text editor to read the JSON code.
- For report files, you need Eurocommand or DITMCO software. If it is an unencrypted ZIP archive, you can rename the extension to .ZIP and extract the contents.
Analyze ER files with viewer.online
Because an .ER file can contain audio, diagrams, or encrypted reports, guessing the format is difficult. viewer.online/er can analyze .ER files to identify the exact format and creator software. You can inspect the file structure, extract readable text, and check whether an online preview is available.
Summary
viewer.online/er is the most effective tool to identify, inspect, and understand .ER files without installing software or dealing with compatibility problems.