DIR (.dir)
.dir file signature | application/x-director
Director (DIR) is a legacy file format used by Macromedia Director, originally developed by Macromedia and later maintained by Adobe after its acquisition of the product line. It stores Director project data used to build interactive multimedia presentations, animations, games, and kiosk applications. The format is largely obsolete, and files may depend on older runtime environments; as with other legacy media files, they should be opened only with trusted software.
Magic Bytes
Offset 0
52 49 46 58
Sources: Wikipedia
All Known Signatures
2 signature variants are documented for .dir files across multiple sources.
Extension
.dir
MIME Type
application/x-director
Byte Offset
0
Risk Level
Safe
Validation Code
How to validate .dir files in Python
def is_dir(file_path: str) -> bool:
"""Check if file is a valid DIR by magic bytes."""
signature = bytes([0x52, 0x49, 0x46, 0x58])
with open(file_path, "rb") as f:
return f.read(4) == signatureHow to validate .dir files in Node.js
function isDIR(buffer: Buffer): boolean {
const signature = Buffer.from([0x52, 0x49, 0x46, 0x58]);
return buffer.subarray(0, 4).equals(signature);
}How to validate .dir files in Go
func IsDIR(data []byte) bool {
signature := []byte{0x52, 0x49, 0x46, 0x58}
if len(data) < 4 {
return false
}
return bytes.Equal(data[:4], signature)
}API Endpoint
/api/v1/dir
curl https://filesignature.org/api/v1/dir
See the full API documentation for all endpoints and parameters.
Related Formats
Frequently Asked Questions
What is a .dir file?
A .dir file is identified by the magic bytes 52 49 46 58 at byte offset 0. Director (DIR) is a legacy file format used by Macromedia Director, originally developed by Macromedia and later maintained by Adobe after its acquisition of the product line. It stores Director project data used to build interactive multimedia presentations, animations, games, and kiosk applications. The format is largely obsolete, and files may depend on older runtime environments; as with other legacy media files, they should be opened only with trusted software.
What are the magic bytes for .dir files?
The magic bytes for DIR files are 52 49 46 58 at byte offset 0. These bytes uniquely identify the file format regardless of the file extension.
How do I validate a .dir file?
To validate a .dir file, read the first bytes of the file and compare them against the known magic bytes (52 49 46 58) at offset 0. This is more reliable than checking the file extension alone, as extensions can be renamed.
What is the MIME type for .dir files?
The primary MIME type for .dir files is application/x-director.
Is it safe to open .dir files?
DIR (.dir) 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.