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WinMX is a peer-to-peer file sharing program authored by Frontcode Technologies and running on Windows operating systems. WinMX began its life as an OpenNAP client capable of connecting to several servers simultaneously, although Frontcode later created a proprietary protocol, termed WinMX Peer Network Protocol (WPNP), which was used starting with WinMX 2 in May 2001. WPNP version 2 was phased out as WinMX 3.0 and its WPNP version 3 protocol came into existence. Frontcode operates several cache servers to aid WPNP network operation. 

WinMX, by default, will only share Audio and Video files, although, if properly configured, it can share almost every type of file. It is also considered a very safe network with a limited number of viruses. WinMX also has a file-size restriction. Files over 2GB will not be shared, and must be split into chunks smaller than 2GB in order to be shared. Although there is no limit to the number of files a user can share on the WPNP network, when a list of a specific user's files is requested (using the 'browse' function) only a limited amount will be shown. These limits are 5000 files for a Primary connection, and 3000 files for a Secondary connection. However, ALL the shared files will be visible to a general search via filename or hash. These limitations do not apply on OpenNap servers.

WinMX allows a person to host chatrooms with its built-in Chat function. There are some rooms reserved for chat, some for trading files, and some which allow both. There are typically around 1500 to 2000 chatrooms open at any given time. WinMX also allows you to message a user using its Private Message function. You can message any user regardless of whether that user is in the same chat room as you or whether you are downloading from/uploading to that user unless his or her settings are configured not to. It is also possible to host chatrooms in languages other than English, such as Japanese, German, French and Italian.

WinMX started out as a Peer-to-Peer program that connected to OpenNap servers. It can still connect to many OpenNap servers. These servers enable users to connect to a wider userbase and also receive many more search results. Two advantages for running OpenNap is the ability to have a permanent list of friends called a hotlist and the ability to share an unlimited number of files.