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 .ace file
A ACE file is an ACE Archive, introduced by Marcel Lemke in 1998. Below: what is actually inside one, and how to open it without installing special software.
What is a .ace file?
ACE Archive is an archive format developed by Marcel Lemke, first appearing in 1998. It is normally produced by WinAce.
Effectively dead, and deliberately so: a critical path-traversal flaw (CVE-2018-20250) led most security tools to drop ACE support entirely.
| Full name | ACE Archive |
|---|---|
| File category | Archives |
| MIME type | application/x-ace-compressed |
| Magic bytes (file signature) | 2A 2A 41 43 45 2A 2A |
| Developer | Marcel Lemke |
| Introduced | 1998 |
| Usually created by | WinAce |
| OpenAnyFile engine | libarchive WASM engine |
| Opens without upload | Yes — parsed locally in your browser |
Open a .ace file in your browser
OpenAnyFile routes .ace 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 .ace 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 ACE 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. No account, no upload, no watermark, no file-size gate.
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 ACE files
Can I open a .ace file without installing special software?
Yes. OpenAnyFile's libarchive WASM engine runs in your browser, so you can read a ACE 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 ACE file?
Look at the first bytes rather than the extension. A genuine ACE begins with 2A 2A 41 43 45 2A 2A. Opening the file in OpenAnyFile shows that signature in the file-details panel, so a file renamed to .ace by mistake is easy to spot.
Is it safe to open a ACE 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 .ace file, exactly?
ACE Archive — an application/x-ace-compressed format created by Marcel Lemke since 1998. Effectively dead, and deliberately so: a critical path-traversal flaw (CVE-2018-20250) led most security tools to drop ACE support entirely.
Does the same viewer handle formats related to ACE?
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 .ace file, it will open too: