ACBM (.acbm)
.acbm file signature | application/octet-stream
Amiga Contiguous Bitmap (ACBM) is an image file format used on the Amiga platform, originally developed under Commodore and associated with the Amiga operating system. It was used for storing bitmap graphics for artwork, screen layouts, and other bitmap-based assets in Amiga software. The format is a legacy part of computing history and is generally safe to open, though support is limited in modern applications.
Magic Bytes
Offset 0
46 4F 52 4D
Sources: Wikipedia
All Known Signatures
2 signature variants are documented for .acbm files across multiple sources.
Extension
.acbm
MIME Type
application/octet-stream
Byte Offset
0
Risk Level
Safe
Validation Code
How to validate .acbm files in Python
def is_acbm(file_path: str) -> bool:
"""Check if file is a valid ACBM by magic bytes."""
signature = bytes([0x46, 0x4F, 0x52, 0x4D])
with open(file_path, "rb") as f:
return f.read(4) == signatureHow to validate .acbm files in Node.js
function isACBM(buffer: Buffer): boolean {
const signature = Buffer.from([0x46, 0x4F, 0x52, 0x4D]);
return buffer.subarray(0, 4).equals(signature);
}How to validate .acbm files in Go
func IsACBM(data []byte) bool {
signature := []byte{0x46, 0x4F, 0x52, 0x4D}
if len(data) < 4 {
return false
}
return bytes.Equal(data[:4], signature)
}API Endpoint
/api/v1/acbm
curl https://filesignature.org/api/v1/acbm
See the full API documentation for all endpoints and parameters.
Frequently Asked Questions
What is a .acbm file?
A .acbm file is identified by the magic bytes 46 4F 52 4D at byte offset 0. Amiga Contiguous Bitmap (ACBM) is an image file format used on the Amiga platform, originally developed under Commodore and associated with the Amiga operating system. It was used for storing bitmap graphics for artwork, screen layouts, and other bitmap-based assets in Amiga software. The format is a legacy part of computing history and is generally safe to open, though support is limited in modern applications.
What are the magic bytes for .acbm files?
The magic bytes for ACBM files are 46 4F 52 4D at byte offset 0. These bytes uniquely identify the file format regardless of the file extension.
How do I validate a .acbm file?
To validate a .acbm file, read the first bytes of the file and compare them against the known magic bytes (46 4F 52 4D) at offset 0. This is more reliable than checking the file extension alone, as extensions can be renamed.
What is the MIME type for .acbm files?
There is no officially registered MIME type for .acbm files. Systems typically use application/octet-stream as a generic fallback when handling this format.
Is it safe to open .acbm files?
ACBM (.acbm) 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.