DCR (.dcr)
.dcr file signature | application/x-director
DCR is a Shockwave content file format developed by Macromedia and later maintained by Adobe as part of the Director and Shockwave platform. It was used to distribute interactive multimedia, animations, games, and web-based presentations in browsers and standalone players. The format is legacy and largely obsolete; like other rich media containers, it can carry executable content, so files from untrusted sources should be opened with caution.
Magic Bytes
Offset 0
52 49 46 58
Sources: Wikipedia
All Known Signatures
2 signature variants are documented for .dcr files across multiple sources.
Extension
.dcr
MIME Type
application/x-director
Byte Offset
0
Risk Level
Safe
Validation Code
How to validate .dcr files in Python
def is_dcr(file_path: str) -> bool:
"""Check if file is a valid DCR by magic bytes."""
signature = bytes([0x52, 0x49, 0x46, 0x58])
with open(file_path, "rb") as f:
return f.read(4) == signatureHow to validate .dcr files in Node.js
function isDCR(buffer: Buffer): boolean {
const signature = Buffer.from([0x52, 0x49, 0x46, 0x58]);
return buffer.subarray(0, 4).equals(signature);
}How to validate .dcr files in Go
func IsDCR(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/dcr
curl https://filesignature.org/api/v1/dcr
See the full API documentation for all endpoints and parameters.
Related Formats
Frequently Asked Questions
What is a .dcr file?
A .dcr file is identified by the magic bytes 52 49 46 58 at byte offset 0. DCR is a Shockwave content file format developed by Macromedia and later maintained by Adobe as part of the Director and Shockwave platform. It was used to distribute interactive multimedia, animations, games, and web-based presentations in browsers and standalone players. The format is legacy and largely obsolete; like other rich media containers, it can carry executable content, so files from untrusted sources should be opened with caution.
What are the magic bytes for .dcr files?
The magic bytes for DCR 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 .dcr file?
To validate a .dcr 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 .dcr files?
The primary MIME type for .dcr files is application/x-director.
Is it safe to open .dcr files?
DCR (.dcr) 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.