VMware BIOS
application/octet-stream
Magic Bytes
Offset: 0
4D 53 43 46
VMware BIOS (NVRAM) is a proprietary configuration format developed by VMware for storing non-volatile random-access memory data within its virtualization software. These files preserve hardware settings, boot order, and system clock states, ensuring that virtual machines maintain persistent configurations across restarts and host migrations. Although this legacy BIOS format is increasingly replaced by UEFI, it remains safe for use and is typically managed automatically by the hypervisor to prevent corruption.
Validation Code
How to validate .nvram files in Python
Python
def is_nvram(file_path: str) -> bool:
"""Check if file is a valid NVRAM by magic bytes."""
signature = bytes([0x4D, 0x53, 0x43, 0x46])
with open(file_path, "rb") as f:
return f.read(4) == signatureHow to validate .nvram files in Node.js
Node.js
function isNVRAM(buffer: Buffer): boolean {
const signature = Buffer.from([0x4D, 0x53, 0x43, 0x46]);
return buffer.subarray(0, 4).equals(signature);
}
Go
func IsNVRAM(data []byte) bool {
signature := []byte{0x4D, 0x53, 0x43, 0x46}
if len(data) < 4 {
return false
}
return bytes.Equal(data[:4], signature)
}API Endpoint
GET
/api/v1/nvram
curl https://filesignature.org/api/v1/nvram