Windows
Compatible applications
Quick Facts
Basic information about this file format
Extension
.MLY
File Type
Menhir Parser Specification File
Category
Programming
Best first step
Use compatible software
Quick Summary
A practical overview of the .mly file format
An MLY file is a source code file used by Menhir, which is a powerful LR(1) parser generator designed specifically for the OCaml programming language. Menhir serves as a modern and more capable alternative to the older ocamlyacc tool. The file contains a formal grammar specification, which typicall…
File extension
.MLY
File type
Menhir Parser Specification File
Category
Programming
Recommended action
Open with a trusted compatible app
How to open a .mly file
Start with a trusted app that supports this format
- Check the file extension carefully and confirm that the file name really ends with .mly.
- Use software that supports this file type. If one app does not work, try another compatible program for the same platform.
- Update the application if the file was created by a newer version of the software.
- Scan files from unknown sources before opening them, especially documents, archives, scripts, installers, and executable files.
What is a .mly file?
File extension details and usage information
An MLY file is a source code file used by Menhir, which is a powerful LR(1) parser generator designed specifically for the OCaml programming language. Menhir serves as a modern and more capable alternative to the older ocamlyacc tool. The file contains a formal grammar specification, which typically consists of declarations for terminal and non-terminal symbols, precedence rules, and production rules associated with semantic actions written in OCaml code. When the Menhir compiler processes a .mly file, it generates OCaml source code (typically .ml and .mli files) that implements a functional and efficient parser for the defined language or data format. This file type is a cornerstone for developers building compilers, interpreters, or complex domain-specific languages within the OCaml ecosystem. It offers advanced features such as parameterized non-terminals, improved error reporting, and a more flexible syntax compared to legacy tools. Because .mly files contain embedded OCaml logic, they are best handled by text editors that support OCaml syntax highlighting and the Menhir grammar format to ensure code correctness and readability.
Software Compatibility
Programs that may open or work with .mly files
macOS
Compatible applications
Linux
Compatible applications
Mobile
Mobile applications
Can .mly files be converted?
Options for saving or exporting this file to another format
In many cases, a .mly file can be converted by opening it in compatible software and using an option such as Save As, Export, or Convert. The available output formats depend on the file type and the application used.
- Use the original software that created the file when possible.
- Check whether the application supports exporting to common formats.
- Be careful with online converters when working with private, business, or sensitive files.
- If conversion fails, the file may be corrupted, incomplete, encrypted, or not actually a .mly file.
Why can't I open a .mly file?
Common reasons this file type may not open correctly
Wrong software
The file may require a specific program that supports the .mly format.
Incorrect extension
The file extension may have been renamed manually, even though the actual file format is different.
Corrupted file
The file may be incomplete, damaged during download, or transferred incorrectly.
Outdated app
Your software may need to be updated before it can open newer versions of this file format.
Frequently Asked Questions
Common questions about .mly files
To open a .mly file, use software that supports this file format.
- Visual Studio Code
- Sublime Text
- Notepad++
- Vim
- Emacs
Open the file in compatible software and look for options such as Save As, Export, or Convert. If no export option is available, the file may require a specialized converter or the original application that created it.
- Verify that the file extension is correct.
- Install or update compatible software.
- Try another application that supports this format.
- Check whether the file is corrupted, incomplete, or encrypted.
A file extension alone does not guarantee whether a file is safe or unsafe. Only open files from trusted sources, scan unknown files before opening them, and be especially careful with executable, script, archive, and document files.
File safety tips
Use caution with unknown files
Only open files from trusted sources. Before opening a .mly file, scan it with antivirus software, verify that the file extension is expected, and avoid running unknown executable, installer, macro-enabled document, or script files.