OpenAnyFile
Works
Viewing, inspecting and verifying. You get a byte-level hex and ASCII dump alongside the detected signature, exact size and type analysis. File details, exact byte size and the detected signature are always shown.
How to open a .msi file
You have a MSI file and nothing on your machine will touch it. Here is what the format actually is, and how to read one in about four seconds without installing anything.
What is a .msi file?
Windows Installer Package is a binary & system format developed by Microsoft, first appearing in 1999. It is normally produced by Enterprise software deployment.
An OLE2 relational database of install actions, not a script — which is why MSI installs can be reliably rolled back.
| Full name | Windows Installer Package |
|---|---|
| File category | Binary & system |
| MIME type | application/x-msi |
| Magic bytes (file signature) | D0 CF 11 E0 A1 B1 1A E1 |
| Developer | Microsoft |
| Introduced | 1999 |
| Usually created by | Enterprise software deployment |
| OpenAnyFile engine | universal hex inspector |
| Opens without upload | Yes — parsed locally in your browser |
Open a .msi file in your browser
OpenAnyFile routes .msi to its universal hex inspector, which inspects a byte-level hex and ASCII dump alongside the detected signature, exact size and type analysis.
- Open the OpenAnyFile opener in this browser — nothing to download or sign up for.
- Drag your .msi 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 universal hex inspector.
- Your MSI opens on its own viewer page: a byte-level hex and ASCII dump alongside the detected signature, exact size and type analysis.
- Use fullscreen for a closer look, or download the file back out unchanged. Works the same on Windows, macOS, Linux, Android and iOS, because it is just a web page.
What you can and cannot do with it here
Does not work
Full-fidelity rendering. This extension has no standard structure, so you get a byte-level inspection rather than a rendered view.
Your {ext} file stays on your device
The entire pipeline — detection, decoding, rendering — runs client-side. Your browser hands the bytes to a decoder compiled to WebAssembly, the result is drawn to the page, and that is the whole journey. No account is created, no file is stored, and no analytics event carries your filename. This is also why there is no size limit imposed by a server: the only ceiling is your own available memory.
Frequently asked questions about MSI files
Can I open a .msi file without installing special software?
Yes. OpenAnyFile's universal hex inspector runs in your browser, so you can read a MSI file with nothing installed. You get a byte-level hex and ASCII dump alongside the detected signature, exact size and type analysis. It will not replace the original application for editing, but it answers 'what is in this file' in seconds.
How can I check a file really is a MSI file?
Look at the first bytes rather than the extension. A genuine MSI begins with D0 CF 11 E0 A1 B1 1A E1. Opening the file in OpenAnyFile shows that signature in the file-details panel, so a file renamed to .msi by mistake is easy to spot.
Is it safe to open a MSI 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 .msi file, exactly?
Windows Installer Package — an application/x-msi format created by Microsoft since 1999. An OLE2 relational database of install actions, not a script — which is why MSI installs can be reliably rolled back.
Does the same viewer handle formats related to MSI?
Yes — the same engine also opens .dll, .doc, .exe, 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 .msi file, it will open too: