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Extensionless is a Windows utility that lets you add new file extensions directly to your context menu with ease. Customize your workflow by adding new templates, defining your own file extensions, and quickly generating files with ready-to-use boilerplates. Discover the most popular boilerplate packs with the built-in ranking list and streamline your project setup like a pro.

file extensions

File extensions are the letters after a file name, like .txt or .jpg, that tell your computer what type of file it is and which program can open it. They help organize files and make it easy to know a file’s format at a glance.

open with defaults

In Windows, “Open with” lets you choose which program to use when opening a file. You can select a one-time app or set a default app so that files of that type always open with your chosen program. This helps manage different file types efficiently and avoid having to pick an app every time.

propriotery / open

Proprietary file extensions are owned or controlled by a specific company or software. They may only work fully with that software and aren’t always compatible with others.
Examples: .docx (Microsoft Word), .psd (Adobe Photoshop), .xlsx (Excel)
Open file extensions are publicly documented and can be used or implemented by anyone. They promote compatibility across different programs.
Examples: .txt, .csv, .html, .png
Key difference: Proprietary extensions are software-specific; open extensions are universal and widely supported.

turn on extension

to turn on an extension go over to the switchbox and find the extension you are looking for and on the botom right you have two checkboxes, click the left one. If the left one is already checked you should already have the extension in your context new file menu.

template an extension

to template an extension go over to the switchbox and find the extension you are looking for and on the botom right you have two checkboxes, click the left one. Now you see a button with a green + sign in a box in the same line, click it and select the file you want to use as a template. Now your newly created files will have the same content as the selected file.

plain text / binary

Text files store information as readable characters—letters, numbers, and symbols—so you can open and edit them with a simple text editor. Examples include .txt, .csv, or .html.
Binary files store data in a format meant for computers to interpret, not humans. They can include anything from images and videos to compiled programs. Examples are .exe, .jpg, or .mp3.
Key difference: Text files are human-readable; binary files are machine-readable.

add your extension

Go to your Extensionless application then go to Utility > Forge and click in the new row's name column and fill out the rest of the info. Don't forget to choose an appliction to open the files with and select it in the switchbox and template it. Make sure my library is checked on the dashboard home or my library page.

open with defaults

In Windows, “Open with” lets you choose which program to use when opening a file. You can select a one-time app or set a default app so that files of that type always open with your chosen program. This helps manage different file types efficiently and avoid having to pick an app every time.

warehouse library

Warehouse library is used if you want to add additional extensions. If you haven't found an extension you need in the switchbox turn on the warehouse library and make sure your extension is checked. Make sure warehouse library switch is turned on the left of the title. The same can be one on the dashboard home.


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