BSZ File

What are BSZ files and how to open them

Are you having problems opening a BSZ file or are you simply curious about its contents? We're here to explain the properties of these files and provide you with software that can open or handle your BSZ files.

What is a BSZ file?

BSZ files have multiple uses, and bsnes Save States is one of them. Read more about the other uses further down the page.

bsnes Save States

These BSZ files contain the save states used in the bsnes, a Super Nintendo emulator. Auto-saves of the states are made when unloading and reloading games. If you accidentally saved or loaded a state, you have the option to undo or redo your action.

How to open BSZ files

Important: Different programs may use files with the BSZ file extension for different purposes, so unless you are sure which format your BSZ file is, you may need to try a few different programs.

While we have not verified the app ourselves yet, our users have suggested a single BSZ opener which you will find listed below.

Last updated: August 25, 2026

All known file formats using extension .BSZ

While bsnes Save States is a popular type of BSZ-file, we know of 2 different uses of the .BSZ file extension. Different software may use files with the same extension for different types of data.

BSplayer Skin

BSplayer Skin files store custom visual themes for the BS.Player media player, defining how the player's interface looks - its buttons, background, menus, slider, fonts, colours, and layout. A skin is made from graphics (buttons, backgrounds, etc.) and a configuration file (usually Skin.ini) that tells BS.Player what to load and where to place everything. BS.Player users or authors design skins to change the player's appearance without altering its core functions.

These skins are produced via tools like BSP SkinMaker: users compose or collect image files (typically BMP format) and write or edit Skin.ini, then package everything together. After composing all needed graphics and configuration, they are zipped together and renamed with the skin's specific extension so BS.Player can use them directly. BS.Player reads the packaged skin or a skin folder and applies the layout and graphics as specified in the ini file.

In technical terms this skin format is a standard ZIP archive renamed to the skin's extension so BS.Player recognises it as a skin package. Internally it includes graphics (button images with names like BPAUSED.BMPPK, BPLAYN.BMPPK, etc.), a Skin.ini file, and possibly Full-Screen panel files (Skinfs.ini), background images like MAIN.BMP, and region-data files for transparency and shape. The archive begins with the bytes PK 03 04 at offset 0. Each internal image file is usually suffixed with ".BMPPK" and certain standard filenames are required for control buttons.

Various apps that use files with this extension

These apps are known to open certain types of BSZ files. Remember, different programs may use BSZ files for different purposes, so you may need to try out a few of them to be able to open your specific file.

Help us help others

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