All File Signatures & Extensions
Search by extension, format name, or MIME type to jump straight to a canonical signature page with validation code and source attribution.
XBM
image/x-xbitmap
Primary Hex
2F 2A 20 58 50 4D
XCAT
text/plain
Primary Hex
54 68 69 73 20 69 73 20 54 65 58 2C
GNU Image Manipulation Program
image/x-xcf
Primary Hex
67 69 6D 70 20 78 63 66 20
XEGRM
text/plain
Primary Hex
54 68 69 73 20 69 73 20 54 65 58 2C
XGRM
text/plain
Primary Hex
54 68 69 73 20 69 73 20 54 65 58 2C
XHT
application/xhtml+xml
Primary Hex
3C 68 74 6D 6C 20 78 6D 6C 6E 73 3D
XHTML
application/xhtml+xml
Primary Hex
3C 68 74 6D 6C 20 78 6D 6C 6E 73 3D
XHTML2
application/xhtml+xml
Primary Hex
3C 68 74 6D 6C 20 78 6D 6C 6E 73 3D
An Object Linking and Embedding
application/vnd.ms-excel
Primary Hex
D0 CF 11 E0 A1 B1 1A E1