What is that file — and how do you open it?

Pick a file type to learn what it is, which free programs open it, and what you can convert it to.

Archives

.rar RAR Archive .zip ZIP Archive

Audio

.mp3 MP3 Audio .wav Waveform Audio

Data

.csv Comma-Separated Values .xlsx Microsoft Excel Spreadsheet

Developer

.html HyperText Markup Language .json JavaScript Object Notation .md Markdown File

Documents

.docx Microsoft Word Document .epub Electronic Publication (E-book) .pdf Portable Document Format .txt Plain Text File

Images

.gif Graphics Interchange Format .heic High Efficiency Image Format .jpg JPEG Image .png Portable Network Graphics .psd Adobe Photoshop Document .svg Scalable Vector Graphics .webp WebP Image

System

.exe Windows Executable .iso Disc Image File

Video

.mov Apple QuickTime Movie .mp4 MPEG-4 Video