All about ASM Files

The ASM file type is primarily associated with Visual Studio.

ASM	File extension: ASM
	File type:	source code

What is an ASM file?

ASM files mostly belong to Visual Studio by Microsoft. An ASM file contains a 3D assembly model created with computer-aided product design/manufacturing software like SolidEdge and Creo. These files have the same filename extension but are coded in different proprietary formats. Another type of ASM file contains a macro for stone parameters used to automate processes in Alphacam computer-aided design/manufacturing software. Integrated development environments like Visual Studio and RAD Studio use an ASM file to store source code written in low-level assembly languages. Digital Editions publication management program uses an ASM file to store the Internet link to an e-book (PDF) publication on a remote server.

How to open an ASM file

You need a suitable software like Visual Studio to open an ASM 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 ASM file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a ASM file directly in the browser:. Just drag the file onto this browser window and drop it.

Online ASM Text Viewer

Choose your .asm file to analyze

or drag and drop it here

Online File Viewer

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ASM file extension format:

To view or edit ASM files you need to know the file format, because it determines how the data in this file is stored. 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. Nonetheless, different programs can utilize the same file extension to represent distinct file formats. Double-clicking on the file often results in an error when opening. When there is a problem with a file, the first step to solving it is to determine the file format. Our evaluation of the ASM files is as follows:

The ASM file extension is used very often and does not have a uniform file format. However, the following two file formats are common:

• 10% of all ASM files are based on the Microsoft Compound File format, which is also known as Compound File Binary File format (CFBF or CFB) or OLE2 Compound Document format. Compound document files are used to structure the contents of a document in the file. It is possible to divide the data into several streams, and to store these streams in different places in the file. In this way compound document files support a complete file system inside the file, the streams are like files in a real file system, and the sections are like subdirectories. The file signature of compound files is defined as D0 CF 11 E0 A1 B1 1A E1, so the first character of a file looks like "DOCFILE". Each ASM file has an application name, which is Solid Edge. The CLSID (class identifier of a Windows component object) is 00c6bf00-483b-11ce-951a-08003601be52. Sections and streams in the file are named Display, IOT, PSMroots, Versions, JBlocks, Attachments, BuildVersions, DocVersion2, JAsmRefAttr, JSitesList, JVisibleData, PARASOLID, PSMcluster0, PSMclustertable, PSMsegmenttable, PSMspacemap, PSMtypetable, PSMuserroots, CustomPropertyVariableInfo, Dynamic Attributes Metadata and JAsmPhysicalPropertiesAttr. Most of these files are 150 KB to 1 MB in size. The file type is old but is used even today.
• 4% of all ASM files start with the bytes .model small, which are crucial for this file format. These files are plain text, which means they can be viewed with any text editor such as Windows Editor, Nano for Linux, and TextEdit for macOS. The file size is in the range of 160 bytes to 1 KB. Certain words are almost always found in the files, such as .model small, .data, .code, stack, mov ah, int 21h, main, mov ax and mov ds.

All other ASM files (86%) have no consistent format, the following 9 formats exist: UGC, section, Segment, ORG and push. Often described as task, assignment, mycode, check, zkemsdk, digit, input or code. Drag & drop your file here to see the file format and a preview of your ASM file!