You can find the list of file extensions associated with the Steam here. This list may not be complete, the Steam may use other filename extensions, too. Please consult the manual of Steam for more information.
Be careful! There are many infected and malicious software on the Internet. Only download files, applications and plugins from trusted sources. If the file has a digital signature, make sure that the signature is valid and the file is from a trusted location.
🔴 The most common file types used by Steam
Android, iOS, Linux, Mac OS X, Windows XP, Windows 7/8/8.1, Windows 10, Windows Server 2012/2016
If you are using another operating system, we cannot help you.
🔴 Trial version of Steam
Trial software is usually a program that you can download and use for a certain period of time. The trial software may include full or limited features. If there is a trial version of Steam, it should be available on their official website.
🔴 Official site of Steam
Using anti-virus software is the most important thing you can do to protect your computer and personal information against viruses and other malicious softwares. Please use anti-virus software and update it frequently.
If you find a new extension, a related link or useful information about Steam, then contact us at our firstname.lastname@example.org e-mail address.