magicnumbers

← home

FD FF FF FF 20

Developer Studio subheader

category
file-signature
normalized
fdffffff20
confirmed
2026-03-15
lookups
1
source
https://www.garykessler.net/

Developer Studio subheader. File extension(s): OPT. Kessler type: Programming. Signature begins at byte offset 512.

Similar magic numbers

valuenamecategory
FD FF FF FF 22 Excel spreadsheet subheader file-signature
FD FF FF FF 23 Excel spreadsheet subheader file-signature
FD FF FF FF 28 Excel spreadsheet subheader file-signature
FD FF FF FF 29 Excel spreadsheet subheader file-signature
FD FF FF FF Thumbs.db subheader file-signature