Skip to content

SIS (.sis)

.sis file signature | application/vnd.symbian.install

Symbian Installation System (SIS) is a package file format used by the Symbian operating system, originally developed by Symbian Ltd. and later maintained within the Symbian platform ecosystem. It is used to distribute and install applications, updates, device drivers, and other software components on Symbian smartphones and related devices. As a legacy format, it may appear in archived software collections and should be treated cautiously when obtained from untrusted sources.

Safe

Magic Bytes

Offset 8
10 00 04 19

Sources: Apache Tika

Extension

.sis

MIME Type

application/vnd.symbian.install

Byte Offset

8

Risk Level

Safe

Validation Code

How to validate .sis files in Python

Python 
def is_sis(file_path: str) -> bool:
    """Check if file is a valid SIS by magic bytes at offset 8."""
    signature = bytes([0x10, 0x00, 0x04, 0x19])
    with open(file_path, "rb") as f:
        f.seek(8)
        return f.read(4) == signature

How to validate .sis files in Node.js

Node.js 
function isSIS(buffer: Buffer): boolean {
  const signature = Buffer.from([0x10, 0x00, 0x04, 0x19]);
  if (buffer.length < 12) return false;
  return buffer.subarray(8, 12).equals(signature);
}

How to validate .sis files in Go

Go 
func IsSIS(data []byte) bool {
    signature := []byte{0x10, 0x00, 0x04, 0x19}
    if len(data) < 12 {
        return false
    }
    return bytes.Equal(data[8:12], signature)
}

API Endpoint

GET /api/v1/sis
curl https://filesignature.org/api/v1/sis

See the full API documentation for all endpoints and parameters.

Related Formats

.sisx

Frequently Asked Questions

What is a .sis file?

A .sis file is identified by the magic bytes 10 00 04 19 at byte offset 8. Symbian Installation System (SIS) is a package file format used by the Symbian operating system, originally developed by Symbian Ltd. and later maintained within the Symbian platform ecosystem. It is used to distribute and install applications, updates, device drivers, and other software components on Symbian smartphones and related devices. As a legacy format, it may appear in archived software collections and should be treated cautiously when obtained from untrusted sources.

What are the magic bytes for .sis files?

The magic bytes for SIS files are 10 00 04 19 at byte offset 8. These bytes uniquely identify the file format regardless of the file extension.

How do I validate a .sis file?

To validate a .sis file, read the first bytes of the file and compare them against the known magic bytes (10 00 04 19) at offset 8. This is more reliable than checking the file extension alone, as extensions can be renamed.

What is the MIME type for .sis files?

The primary MIME type for .sis files is application/vnd.symbian.install.

Is it safe to open .sis files?

SIS (.sis) files are generally safe to open. They are classified as low risk because they primarily contain data rather than executable code. However, always ensure files come from a trusted source.