Using checksums in file format?

[Makman2]

Checksums add a layer of security, but to handle them correctly is quite complicated. The data format is quite simple so it is maybe not really worth it.
So in short:

Pro:

• Check if data was corrupted
• Minimal extra file size (in concrete: 8 bytes extra, that's nothing)

Contra:

• Difficult to implement
• Writing data costs more time since checksum calculation takes place
• The format is so simple, no extra security needed.