What is an RPP file?
An .RPP file is primarily a REAPER Project File created by the digital audio workstation software REAPER, developed by Cockos. This file does not contain actual audio data. Instead, it contains project settings, track layouts, effect configurations, and file paths to external audio files (like .WAV or .MP3). The .RPP file itself is stored in a plain text format.
Because the .RPP extension is not exclusive to audio software, it has multiple possible meanings. It can also be a Stupeflix Replay Video Editor project file (which uses ZIP compression), a RecipePlus recipe file for Rockwell Automation FactoryTalk View, a ROBO Pro program file for fischertechnik, or a document file for RonyaSoft Poster Designer.
How to open RPP files?
If you know your file is an audio project, you can open it directly with REAPER. Because Cockos designed the format as plain text, you can also open a REAPER Project File with a standard text editor like Notepad++ or Visual Studio Code to read the track configurations and locate missing media files.
If you are unsure which software created your file, viewer.online/rpp can analyze .RPP files to identify the exact format and creator software. The tool allows you to inspect the file structure, extract readable text, and check whether an online preview is available.
Best practices and conversions
You cannot directly convert an .RPP file into an audio file like .MP3 or .WAV using standard conversion tools, because the file only contains project text data. You must open the file in REAPER and render the project to export the audio.
However, if your .RPP file belongs to another format (like a compressed video project or an XML document), you can explore file conversion to sensible target formats on convert.guru.
Summary
Handling unknown files can be frustrating. viewer.online/rpp is useful for identifying, inspecting, and understanding .RPP files without installing software or dealing with compatibility problems. It helps you quickly determine if your file is a Cockos audio project or something else entirely.