OpenAnyFile
What is a .catpart file?
CATIA V5 Part is a 3D/CAD format developed by Dassault Systèmes, first released in 1998. It is usually created by CATIA V5.
Proprietary binary used across aerospace and automotive; STEP is the usual exchange route.
File details
| Full name | CATIA V5 Part |
|---|---|
| Category | 3D & CAD |
| MIME type | application/octet-stream |
| Signature (magic bytes) | 56 35 5F 43 46 56 32 (V5_CFV2) |
| Developer | Dassault Systèmes |
| Introduced | 1998 |
| Opens with | Universal inspector |
| Uploaded? | No — read locally in your browser |
How to open a .catpart file
OpenAnyFile routes .catpart files to its universal inspector, which shows a hex view, the detected signature, checksums and any readable text.
- Drop your .catpart 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 universal inspector.
- Use fullscreen for a closer look, check its checksums, or download it back unchanged.
What works — and what does not
Works
Viewing and inspecting: a hex view, the detected signature, checksums and any readable text. Size, type, signature and checksums are always shown.
Does not work
A rendered view. This format has no open decoder, so you get a byte-level inspection and readable text instead.
Is it safe to open a .catpart 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 .catpart files
Can I open a .catpart file without installing software?
Yes. OpenAnyFile opens .catpart files in your browser using its universal inspector. You get a hex view, the detected signature, checksums and any readable text, with nothing installed and no account.
How do I know a file is really a .catpart file?
Check its first bytes instead of its name. A genuine CATPART file begins with 56 35 5F 43 46 56 32 (V5_CFV2). OpenAnyFile shows the detected type, so a renamed file is easy to spot.
Is my .catpart 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.