OpenAnyFile
What is a .rpp file?
REAPER Project is an audio format developed by Cockos, first released in 2006. It is usually created by REAPER.
A human-readable text file. Items, envelopes and plugin states can be inspected — and repaired — with a text editor.
File details
| Full name | REAPER Project |
|---|---|
| Category | Audio |
| MIME type | text/plain |
| Signature (magic bytes) | 3C 52 45 41 50 45 52 5F 50 52 4F 4A 45 43 54 (<REAPER_PROJECT) |
| Developer | Cockos |
| Introduced | 2006 |
| Opens with | Text reader |
| Uploaded? | No — read locally in your browser |
How to open a .rpp file
OpenAnyFile routes .rpp files to its text reader, which shows the full text.
- Drop your .rpp file on the box above, click it to choose the file, or paste it with Ctrl+V.
- The real format is detected from the file's first bytes — not just its name.
- The file opens in the text reader.
- Use fullscreen for a closer look, check its checksums, or download it back unchanged.
What works — and what does not
Works
Viewing and inspecting: the full text. Size, type, signature and checksums are always shown.
Does not work
Editing and saving back. OpenAnyFile is a viewer, not an editor — for changes you still need the original app.
Is it safe to open a .rpp file online?
Here, yes — because nothing is uploaded. Most "online viewers" send your file to their server. OpenAnyFile reads it with your browser's File API and decodes it on your own device, so there is no copy anywhere else. You can check: open your browser's network tab while opening a file — no upload appears.
Questions about .rpp files
Can I open a .rpp file without installing software?
Yes. OpenAnyFile opens .rpp files in your browser using its text reader. You get the full text, with nothing installed and no account.
How do I know a file is really a .rpp file?
Check its first bytes instead of its name. A genuine RPP file begins with 3C 52 45 41 50 45 52 5F 50 52 4F 4A 45 43 54 (<REAPER_PROJECT). OpenAnyFile shows the detected type, so a renamed file is easy to spot.
Is my .rpp file uploaded anywhere?
No. The file is read locally by your browser and never sent to a server — it even works offline once the page has loaded.
Does it work on phones?
Yes — on Android and iPhone, in any modern browser. You can also install OpenAnyFile as an app.
Related formats
Other formats from the same family:
Format facts checked and page updated on September 25, 2026.