Harvard Graphics presentation file
application/octet-stream
Magic Bytes
Offset: 0
49 20 49
The SH3 format is a legacy presentation file developed by Software Publishing Corporation for use with Harvard Graphics. This proprietary binary format was primarily utilized for creating business slideshows, statistical charts, and visual aids during the DOS and early Windows computing eras. While generally considered safe due to its age and lack of executable features, modern systems require specialized conversion tools or legacy software to access the data today.
Validation Code
How to validate .sh3 files in Python
Python
def is_sh3(file_path: str) -> bool:
"""Check if file is a valid SH3 by magic bytes."""
signature = bytes([0x49, 0x20, 0x49])
with open(file_path, "rb") as f:
return f.read(3) == signatureHow to validate .sh3 files in Node.js
Node.js
function isSH3(buffer: Buffer): boolean {
const signature = Buffer.from([0x49, 0x20, 0x49]);
return buffer.subarray(0, 3).equals(signature);
}
Go
func IsSH3(data []byte) bool {
signature := []byte{0x49, 0x20, 0x49}
if len(data) < 3 {
return false
}
return bytes.Equal(data[:3], signature)
}API Endpoint
GET
/api/v1/sh3
curl https://filesignature.org/api/v1/sh3