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File Extensions
Help and Tips

Explains DOS/Windows file extensions, how to view files of various extensions, and why unexpected file extensions can cause security risks.Bookmark and Share

#1: SCR File Format
Screensavers defined. Also contains links to websites where you can download screensavers.
 
#2: TMP File Format
TMP files are temporary files that can sometimes be safely removed.
 
#3: PPT File Format
PPT files are presentations (slideshows) created by Microsoft PowerPoint. This tip has links to free software that can view PPT files.
 
#4: TTF File Format
TTF files are TrueType fonts. This tip also includes websites where you can download TrueType (TTF) fonts.
 
#5: PSD File Format
PSD files are graphic files created by Adobe PhotoShop and other tools.
 
#6: REG File Format
Provides details of the .REG file format in Windows used by the Registry Editor.
 
#7: AIF / AIFF File Format
Explains .AIF / .AIFF files - audio files most often used on the Macintosh platform.
 
#8: CFG File Format
Information on the .CFG file format, normally a configuration file.
 
#9: CPL File Format
Some details about .CPL files, Windows Control Panel applets.
 
#10: RAR File Format
RAR archives defined. How they are packed and unpacked.
 
#11: What Are File Extensions?
File extensions defined. This tip explains what the usually three characters are for.
 
#12: PL and PM File Formats
A brief explanation of Perl scripts found in .PL and .PM files.
 
#13: BAK or BK File Format
BAK and BK files usually are backups of other documents or files.
 
#14: MID File Format
MID files represent MIDI music. Learn how to play and create these songs.
 
#15: TXT File Format
The TXT plain-text file format defined.
 
#16: ARC File Format
Explains what ARC files are. Although rarely-used nowadays, some may run across these archives.
 
#17: DOC File Format
This defines the DOC file format, usually word processing files created from WordPerfect or Microsoft Word.
 
#18: EXE File Format
The EXE executable (program) file format defined.
 
#19: LOG File Fomat
LOG files are usually text file logs of processes running on your machine.
 
#20: FNT and FON File Formats
Explains .FNT and .FON fonts and why they differ from TrueType fonts.
 
#21: 1ST File Format
The 1ST file format defined. These are usually text files with instructions to read before running software.
 
#22: ANI File Format
Defines .ANI files - Windows animated cursors.
 
#23: ASC File Format
Defines the ASC file format that normally represents text files.
 
#24: PDF File Format
Explains what PDF files are and how they can be created or read.
 
#25: Be Careful with Files Containing Multiple Extensions
Files with multiple extensions may be Trojan Horses waiting for you to open them and release their nefarious content. Be careful with these files.
 
#26: DAT File Format
Just what are .DAT files, and are they readable?
 
#27: AU File Format
AU files are audio files popular on the Solaris and Unix platforms.
 
#28: DIZ and NFO File Formats
Description files .DIZ and .NFO defined.
 
#29: BAT File Format
The BAT file format defined. These are batch files for MS-DOS or MS-Windows systems.
 
#30: Viewing File Extensions on Windows
Help protect yourself from accidentally opening rogue files by forcing Explorer to show all files' extensions.
 
#31: BMP File Format
BMP files are uncompressed images, Windows bitmaps.
 
#32: ZIP File Format
Zip archives defined, including how they are created and unpacked.
 
#33: WAV File Format
WAV files are audio files popular on the Windows platform.
 
#34: MOV File Format
A brief explanation of .MOV files - QuickTime multimedia.
 
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