OpenAnyFile
Works
Viewing, inspecting and verifying. You get a browsable listing of everything inside, decompressed in-browser by libarchive compiled to WebAssembly. File details, exact byte size and the detected signature are always shown.
How to open a .z01 file
The short version: Z01 is a Split ZIP Volume from PKWARE / WinZip. The longer version — including the quirk that trips most people up — is below, along with a viewer that runs entirely on your own device.
What is a .z01 file?
Split ZIP Volume is an archive format developed by PKWARE / WinZip, first appearing in 1993. It is normally produced by WinZip, 7-Zip.
Part of a multi-volume set. Extraction must start from the final .zip, which holds the central directory — opening .z01 alone always fails.
| Full name | Split ZIP Volume |
|---|---|
| File category | Archives |
| MIME type | application/zip |
| Magic bytes (file signature) | 50 4B 07 08 or PK.. |
| Developer | PKWARE / WinZip |
| Introduced | 1993 |
| Usually created by | WinZip, 7-Zip |
| OpenAnyFile engine | libarchive WASM engine |
| Opens without upload | Yes — parsed locally in your browser |
Open a .z01 file in your browser
OpenAnyFile routes .z01 to its libarchive WASM engine, which opens a browsable listing of everything inside, decompressed in-browser by libarchive compiled to WebAssembly.
- Open the OpenAnyFile opener in this browser — nothing to download or sign up for.
- Drag your .z01 file onto the drop zone, click to browse for it, or paste it with Ctrl+V.
- The extension is detected and the file is handed to the libarchive WASM engine.
- Your Z01 opens on its own viewer page: a browsable listing of everything inside, decompressed in-browser by libarchive compiled to WebAssembly.
- Use fullscreen for a closer look, or download the file back out unchanged. Free, and free in the sense that there is no paid tier waiting behind step three.
What you can and cannot do with it here
Does not work
Editing and re-saving. OpenAnyFile is a reader, not an editor — for changes you still need special software or an equivalent.
Is it safe to open a {E} file on a website?
It depends entirely on whether the website uploads it, and almost all of them do. That is a real problem when the archives file in question is a contract, a client deliverable or something under NDA. OpenAnyFile removes the question: the decoding happens inside your browser tab, so there is no transfer, no queue, no temporary storage and no retention window to read about in a privacy policy.
Frequently asked questions about Z01 files
Can I open a .z01 file without installing special software?
Yes. OpenAnyFile's libarchive WASM engine runs in your browser, so you can read a Z01 file with nothing installed. You get a browsable listing of everything inside, decompressed in-browser by libarchive compiled to WebAssembly. For full editing you still need the original application — this is a viewer, not an editor.
How can I check a file really is a Z01 file?
Look at the first bytes rather than the extension. A genuine Z01 begins with 50 4B 07 08 or PK... Opening the file in OpenAnyFile shows that signature in the file-details panel, so a file renamed to .z01 by mistake is easy to spot.
Is it safe to open a Z01 file online?
With OpenAnyFile, yes, because nothing is uploaded. The file is read locally through your browser's File API and never leaves your device, so there is no server copy to leak, log or retain. That matters most for the kind of file people are least willing to hand to a random converter site.
What is a .z01 file, exactly?
Split ZIP Volume — an application/zip format created by PKWARE / WinZip since 1993. Part of a multi-volume set. Extraction must start from the final .zip, which holds the central directory — opening .z01 alone always fails.
Does the same viewer handle formats related to Z01?
Yes — the same engine also opens .7z, .iso, .rar, so you can compare related files without switching tools.
Related formats
These open with the same engine, so if you have one of these sitting next to your .z01 file, it will open too: