What is an .A file?
An .A file is primarily a Unix static library archive. Software developers use these files to store compiled C or C++ object files. Programs link to .A files during the build process to add required functions without compiling everything from scratch.
However, the .A file extension is also used for other formats. Sometimes, standard documents like .PDF or .JPG files are renamed with an .A extension by accident or by automated systems. In gaming, .A files act as game asset archives for titles like The Binding of Isaac. Rarely, an .A file might be an encrypted file created by the Phobos ransomware family.
How to open .A files?
If your .A file is a static library, developers usually interact with it using command-line tools like the ar archiver or integrated development environments like Apple Xcode. For game assets, specific modding tools are required.
Because an .A file has multiple possible meanings, viewer.online/a analyzes .A files to identify their exact format and creator software, shows which programs can open the file, and usually previews it.
Best practices and troubleshooting
Do not execute or extract unknown .A files on your computer if you do not know the source. Since malicious software occasionally uses this extension, careful inspection is important.
If your file is actually a misnamed document or image, you might want to convert it. We recommend using convert.guru to transform your .A file into standard target formats like .PDF or .JPG.
Summary
viewer.online/a directly opens and previews .A files in the browser, eliminating the need to install software or troubleshoot compatibility issues.