RBXL (.rbxl)
.rbxl file signature | application/octet-stream
RBXL is a Roblox place file format used by Roblox Corporation’s Roblox Studio to store game worlds and their associated objects, terrain, scripts, and settings. It is used for developing, editing, and exchanging place data for experiences published on the Roblox platform, including single-player tests and collaborative projects. The format is generally safe, though files from untrusted sources should be reviewed because they may contain scripts or references that affect project behavior.
Magic Bytes
Offset 0
3C 72 6F 62 6C 6F 78 21
Sources: Wikipedia
Extension
.rbxl
MIME Type
application/octet-stream
Byte Offset
0
Risk Level
Safe
Validation Code
How to validate .rbxl files in Python
def is_rbxl(file_path: str) -> bool:
"""Check if file is a valid RBXL by magic bytes."""
signature = bytes([0x3C, 0x72, 0x6F, 0x62, 0x6C, 0x6F, 0x78, 0x21])
with open(file_path, "rb") as f:
return f.read(8) == signatureHow to validate .rbxl files in Node.js
function isRBXL(buffer: Buffer): boolean {
const signature = Buffer.from([0x3C, 0x72, 0x6F, 0x62, 0x6C, 0x6F, 0x78, 0x21]);
return buffer.subarray(0, 8).equals(signature);
}How to validate .rbxl files in Go
func IsRBXL(data []byte) bool {
signature := []byte{0x3C, 0x72, 0x6F, 0x62, 0x6C, 0x6F, 0x78, 0x21}
if len(data) < 8 {
return false
}
return bytes.Equal(data[:8], signature)
}API Endpoint
/api/v1/rbxl
curl https://filesignature.org/api/v1/rbxl
See the full API documentation for all endpoints and parameters.
Frequently Asked Questions
What is a .rbxl file?
A .rbxl file is identified by the magic bytes 3C 72 6F 62 6C 6F 78 21 at byte offset 0. RBXL is a Roblox place file format used by Roblox Corporation’s Roblox Studio to store game worlds and their associated objects, terrain, scripts, and settings. It is used for developing, editing, and exchanging place data for experiences published on the Roblox platform, including single-player tests and collaborative projects. The format is generally safe, though files from untrusted sources should be reviewed because they may contain scripts or references that affect project behavior.
What are the magic bytes for .rbxl files?
The magic bytes for RBXL files are 3C 72 6F 62 6C 6F 78 21 at byte offset 0. These bytes uniquely identify the file format regardless of the file extension.
How do I validate a .rbxl file?
To validate a .rbxl file, read the first bytes of the file and compare them against the known magic bytes (3C 72 6F 62 6C 6F 78 21) at offset 0. This is more reliable than checking the file extension alone, as extensions can be renamed.
What is the MIME type for .rbxl files?
There is no officially registered MIME type for .rbxl files. Systems typically use application/octet-stream as a generic fallback when handling this format.
Is it safe to open .rbxl files?
RBXL (.rbxl) 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.