Microsoft Document Imaging file
image/vnd.ms-modi
Magic Bytes
Offset: 0
45 50 2A 00
Microsoft Document Imaging (MDI) is a proprietary graphics format developed by Microsoft, derived from the Tagged Image File Format (TIFF) specification. It was primarily designed to store scanned documents, optical character recognition (OCR) data, and annotations within the Microsoft Office Document Imaging (MODI) component of Office 2003 and 2007. This legacy format is now considered obsolete; Microsoft deprecated support in Office 2010, encouraging migration to standard PDF or TIFF files for long-term accessibility.
Validation Code
How to validate .mdi files in Python
Python
def is_mdi(file_path: str) -> bool:
"""Check if file is a valid MDI by magic bytes."""
signature = bytes([0x45, 0x50, 0x2A, 0x00])
with open(file_path, "rb") as f:
return f.read(4) == signatureHow to validate .mdi files in Node.js
Node.js
function isMDI(buffer: Buffer): boolean {
const signature = Buffer.from([0x45, 0x50, 0x2A, 0x00]);
return buffer.subarray(0, 4).equals(signature);
}
Go
func IsMDI(data []byte) bool {
signature := []byte{0x45, 0x50, 0x2A, 0x00}
if len(data) < 4 {
return false
}
return bytes.Equal(data[:4], signature)
}API Endpoint
GET
/api/v1/mdi
curl https://filesignature.org/api/v1/mdi