Opening an ATSP File

The ATSP file type is primarily associated with Concorde TSP Solver, other ATSP solvers.

ATSP	File extension: ATSP
	File type:	ATSP problem data

What is an ATSP file?

ATSP files mostly belong to Concorde TSP Solver, other ATSP solvers. An ATSP file stores data related to the Asymmetric Traveling Salesman Problem (ATSP). The ATSP is a variation of the classic Traveling Salesman Problem where the cost of traveling between two cities is not necessarily the same in both directions. These files typically contain information about the cities or nodes, the distances or costs between them (represented as a matrix), and potentially other relevant parameters for the problem instance. Specialized solver software uses these files as input to find the most efficient route that visits each city exactly once and returns to the starting city, minimizing the total travel cost. The format can vary depending on the specific solver used, but often involves a matrix representation of the distances between cities.

How to open ATSP files

You need a suitable software like Concorde TSP Solver, other ATSP solvers to open an ATSP file. You need a suitable software like Concorde TSP Solver, other ATSP solvers to open an ATSP file. Without proper software you will receive a Windows message "How do you want to open this file?" or "Windows cannot open this file" or a similar Mac/iPhone/Android alert. If you cannot open your ATSP file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a ATSP file directly in the browser:. Just drag the file onto this browser window and drop it.

Online ATSP Text Viewer

Choose your .atsp file to analyze

or drag and drop it here

Online File Viewer

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.ATSP File Not Opening? How to Fix It:

ATSP files can originate from various programs and aren't universally openable.

1. Identify the Source: If received from an operations research analyst or computer science project, it likely contains Asymmetric Traveling Salesperson Problem data.
2. Check the Header: Open the file in a text editor to inspect its contents:
   • Readable text starting with NAME: or TYPE: ATSP confirms standard TSPLIB format.
   • Unreadable symbols or magic bytes like PK suggest a compressed archive.
3. Use the Original Software: You usually need the original program to process these files; try Concorde TSP Solver, other ATSP solvers, or ask the sender.
4. Use this Webpage: Drag and drop your .ATSP file into our viewer to detect the format, extract readable text, and preview when possible.

ATSP file extension format:

Why is it important to know the file format? This is the only way to find out which program to use to open the file. Each file format has a unique extension and almost always a unique signature. For example, Microsoft Word documents have the extension .docx and the signature (usually the first 3 characters in this file) PK. If the file extension does not match the file format, double-clicking on the file will cause an error upon opening. Knowledge is power - this also applies when dealing with unknown or faulty files. Below you will find our evaluation of the ATSP files:

ATSP is seldom used as a file extension and includes different formats for different programs. The two most common formats are as follows:

• 60% of all ATSP files belong to TSPLIB Asymmetric Traveling Salesman Problem data. The contents of these files can even be read by a human. The file size is in the range of 1 KB to 40 KB. The file type was primarily used more than 20 years ago. The files contain the following words: EDGE_WEIGHT_FORMAT: FULL_MATRIX, EDGE_WEIGHT_SECTION, EDGE_WEIGHT_TYPE: EXPLICIT, NAME, TYPE: ATSP, COMMENT: Asymmetric TSP (Fischetti) and DIMENSION: 17. A common filename is br17.atsp or ftv33.atsp. Such ATSP files store data about problem.
• 7% of all ATSP files start with the magic bytes 17 0,3,5,48,48,8,8,5,5,3,3,0,3,5,8,8,5 3,0,3,48, which are always the first bytes of this file format. These files are text files, so they contain words and text. ATSP files are between 670 bytes and 700 bytes in size. Some examples of file names are testFile.atsp.

All other ATSP files (33%) have no uniform format. Just click the "Choose your .atsp file to analyze" button on this page to find out what your ATSP file is.