File Extensions
Help and Tips

#1: What Are File Extensions?
File extensions defined. This tip explains what the usually three characters are for.
 
#2: Viewing File Extensions on Windows
Help protect yourself from accidentally opening rogue files by forcing Explorer to show all files' extensions.
 
#3: 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.
 
#4: EXE File Format
The EXE executable (program) file format defined.
 
#5: TXT File Format
The TXT plain-text file format defined.
 
#6: ZIP File Format
Zip archives defined, including how they are created and unpacked.
 
#7: DIZ and NFO File Formats
Description files .DIZ and .NFO defined.
 
#8: RAR File Format
RAR archives defined. How they are packed and unpacked.
 
#9: TTF File Format
TrueType font definitions. Also includes websites you can download TrueType fonts.
 
#10: PDF File Format
Explains what PDF files are and how they can be created or read.
 
#11: SCR File Format
Screensavers defined. Also contains links to websites where you can download screensavers.
 
#12: TMP File Format
TMP files are temporary files that can sometimes be safely removed.
 
#13: WAV File Format
WAV files are audio files popular on the Windows platform.
 
#14: AU File Format
AU files are audio files popular on the Solaris and Unix platforms.
 
#15: PSD File Format
PSD files are graphic files created by Adobe PhotoShop and other tools.
 
#16: BAK or BK File Format
BAK and BK files usually are backups of other documents or files.
 
#17: BMP File Format
BMP files are uncompressed images, Windows bitmaps.
 
#18: LOG File Fomat
LOG files are usually text file logs of processes running on your machine.
 
#19: MID File Format
MID files represent MIDI music. Learn how to play and create these songs.
 
#20: PPT File Format
PPT files are presentations (slideshows) created by Microsoft PowerPoint. This tip has links to free software that can view PPT files.
 
#21: 1ST File Format
The 1ST file format defined. These are usually text files with instructions to read before running software.
 
#22: ARC File Format
Explains what ARC files are. Although rarely-used nowadays, some may run across these archives.
 
#23: BAT File Format
The BAT file format defined. These are batch files for MS-DOS or MS-Windows systems.
 
#24: ASC File Format
Defines the ASC file format that normally represents text files.
 
#25: DOC File Format
This defines the DOC file format, usually word processing files created from WordPerfect or Microsoft Word.
 

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