OpenAnyFile
What is a .vcs file?
vCalendar 1.0 is an email and contacts format developed by Versit Consortium / IMC, first released in 1996. It is usually created by Old Outlook, feature phones.
The predecessor of iCalendar (.ics); many phones still export calendar entries as .vcs.
File details
| Full name | vCalendar 1.0 |
|---|---|
| Category | Email & contacts |
| MIME type | text/x-vcalendar |
| Signature (magic bytes) | 42 45 47 49 4E 3A 56 43 41 4C 45 4E 44 41 52 (BEGIN:VCALENDAR) |
| Developer | Versit Consortium / IMC |
| Introduced | 1996 |
| Opens with | Contact and calendar reader |
| Uploaded? | No — read locally in your browser |
How to open a .vcs file
OpenAnyFile routes .vcs files to its contact and calendar reader, which shows the fields as a readable list.
- Drop your .vcs 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 contact and calendar reader.
- Use fullscreen for a closer look, check its checksums, or download it back unchanged.
What works — and what does not
Works
Viewing and inspecting: the fields as a readable list. Size, type, signature and checksums are always shown.
Does not work
Editing and saving back. OpenAnyFile is a viewer, not an editor — for changes you still need the original app.
Is it safe to open a .vcs 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 .vcs files
Can I open a .vcs file without installing software?
Yes. OpenAnyFile opens .vcs files in your browser using its contact and calendar reader. You get the fields as a readable list, with nothing installed and no account.
How do I know a file is really a .vcs file?
Check its first bytes instead of its name. A genuine VCS file begins with 42 45 47 49 4E 3A 56 43 41 4C 45 4E 44 41 52 (BEGIN:VCALENDAR). OpenAnyFile shows the detected type, so a renamed file is easy to spot.
Is my .vcs 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.