You may have noticed that file names are usually followed by a period and three letters. This three letter sequence is known as the ‘file extension’ and is a way for the computer to recognize what type of file formatting you are opening.
Some of the more common file extensions are as follows:
Microsoft Word —.doc
Microsoft Excel —.xls
Microsoft PowerPoint —.ppt
Images .gif or —.jpg
Video .mov or —.mpg
Sound or Audio —.mp3 or .wav
7z — 7-Zip compressed file
ISO — The generic file format for most optical media, including CD-ROM, DVD-ROM, Blu-ray Disc, HD DVD and UMD.
Desktop publishing extensions
AI — Adobe Illustrator
AVE / ZAVE — Aquafadas
CDR — CorelDRAW
CHP / pub / STY / CAP / CIF / VGR / FRM — Ventura Publisher — Xerox (DOS / GEM)
CPT — Corel Photo-Paint
DTP — Greenstreet Publisher, GST PressWorks
GDRAW — Google Drive Drawing
ILDOC — Broadvision Quicksilver document
INDD — Adobe InDesign
PSD — Adobe Photoshop
MCF — FotoInsight Designer
PDF — Adobe Acrobat or Adobe Reader
PMD — Adobe PageMaker
PPP — Serif PagePlus
PUB — Microsoft Publisher
QXD — QuarkXPress
FM — Adobe FrameMaker
SLA / SCD — Scribus
WLMP — Windows Live Movie Maker project file
Font extensions
ABF — Adobe Binary Screen Font
AFM — Adobe Font Metrics
BDF — Bitmap Distribution Format
BMF — ByteMap Font Format
FNT — Bitmapped Font — Graphics Environment Manager (GEM)
FON — Bitmapped Font — Microsoft Windows
MGF — MicroGrafx Font
OTF — OpenType Font
PCF — Portable Compiled Format
PostScript Font — Type 1, Type 2
PFA — Printer Font ASCII
PFB — Printer Font Binary — Adobe
PFM — Printer Font Metrics — Adobe
AFM — Adobe Font Metrics
FOND — Font Description resource — Mac OS
SFD — FontForge spline font database Font
SNF — Server Normal Format
TDF — TheDraw Font
TFM — TeX font metric
TTF (.ttf, .ttc) — TrueType Font
WOFF — Web Open Font Format
