PNG portable network graphics. Editable in Photoshop and Corel Paint Shop Pro. Viewable in all browsers. Best feature: super-duper compression.
DLL dynamic link library. These are system files that are used in conjunction with other programs. You can't edit them directly.
EXE executable file. This is an instruction to execute a program. You can't edit EXE files in Word or view them in your web browser.
FLV flash video. This video type can be used in Google video and Youtube. Best feature: you don't need a special player; it works thru Adobe's software which you already have installed on your computer.
RAR roshal archive file. It's named for its creator, Eugene Roshal. It's used for file compression. Rar files can wrap up several files in one nice little package. You can open them with WinRAR. Best feature: the resulting file is a fraction of the original size.
RTF rich text format. It's a word-processing format. Best feature: it works in many programs and operating systems.
ZIP another compression format. It is done thru a zip program (Winzip, 7zip, or PKzip to name a few) and it provides minimal compression.
TMP temporary file. When downloading web pages each part stores as a temp file on your computer. They are not meant to be opened. Usually it's safe to delete temp files. It's best to delete temporary internet files in the web browser rather than in Windows Explorer. Other programs can also create temp files.
MP4 motion picture expert group is an audio/video file. Playable in media players and on portable devices.
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