com

.com — Common Data

Microsoft · 1980

Developer

Microsoft

Key Features

Binary storage behavior for typical executable workflows
Common MIME type: application/octet-stream
Recognizable file signature: Not applicable for .COM files as they are simple executables without a distinct header signature.
Associated with Microsoft

Best For

Software execution
Installers and utilities
Compiled tool delivery

Less Ideal For

Opening on untrusted systems
Simple document sharing
Collaborative editing workflows

Common Use Cases

Launching apps or installers
Running command-line tools
Distributing compiled software

How to Open It

On Windows, open the file with DOSBox or Command Prompt (emulation).
On macOS, open the file with DOSBox.
If the file does not open, confirm that the extension really matches .com and that the download or transfer completed without corruption.

What is a .com file?

The .COM file extension typically refers to a DOS executable file, often used in older operating systems like MS-DOS and Windows. These files contain machine code that the computer can directly execute. While less common in modern computing, understanding .COM files is important for historical context and retro computing.

Programs That Open .com Files

Platform	Program
Windows	DOSBox	Free
	Command Prompt (emulation)	Free	Official
macOS	DOSBox	Free

Common Problems with .com Files

⚠️ File not found or cannot be opened.

Ensure the .COM file is in the correct directory or path. Verify that the file is not corrupted.

⚠️ Program crashes or behaves unexpectedly.

This can be due to compatibility issues with the operating system or hardware. Try running it in an emulator like DOSBox.

⚠️ Security concerns with unknown .COM files.

Do not open .COM files from untrusted sources, as they can contain malware. Scan them with an antivirus program.

Frequently Asked Questions

What is a .COM file?▼

A .COM file is a simple executable file format used primarily in MS-DOS and early Windows operating systems. It contains machine code that the CPU can run directly.

Can I run .COM files on modern Windows?▼

Generally, modern Windows versions do not directly support running .COM files. You typically need an emulator like DOSBox to run them.

Are .COM files safe?▼

.COM files can be dangerous if they come from untrusted sources, as they can contain malware. Always exercise caution and scan them with antivirus software.

Technical Details

.COM files are simple, flat binary files with a maximum size of 65,536 bytes. They consist of a small executable program and data, often loaded directly into memory and executed.

Did You Know?

The .COM format was one of the first executable file formats used by personal computers.

Despite its simplicity, the .COM format was incredibly versatile for its time.

.COM files are limited to 64KB in size, including the code and data.

Security Information

While .COM files themselves are not inherently malicious, they can be used to deliver malware. Always scan .COM files from untrusted sources with an up-to-date antivirus program before executing.