OpenAnyFile
What is a .x_b file?
Parasolid Binary is a 3D/CAD format developed by Siemens Digital Industries, first released in 1988. It is usually created by SOLIDWORKS, NX, Onshape.
The binary twin of x_t — smaller, with identical geometry.
File details
| Full name | Parasolid Binary |
|---|---|
| Category | 3D & CAD |
| MIME type | application/octet-stream |
| Developer | Siemens Digital Industries |
| Introduced | 1988 |
| Opens with | Universal inspector |
| Uploaded? | No — read locally in your browser |
How to open a .x_b file
OpenAnyFile routes .x_b files to its universal inspector, which shows a hex view, the detected signature, checksums and any readable text.
- Drop your .x_b 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 .x_b 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 .x_b files
Can I open a .x_b file without installing software?
Yes. OpenAnyFile opens .x_b 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 .x_b file?
Check its first bytes instead of its name. This format has no fixed signature, so the detected type and the readable content are the best clues. OpenAnyFile shows the detected type, so a renamed file is easy to spot.
Is my .x_b 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.