Files with the extension ASM are source code files in assembler programming language. An assembly language is a so-called low-level programming language that represents a human-readable form of machine language of a particular processor architecture (eg, x86, MIPS, PowerPC).
ASM files can contain the source code for entire programs or only parts, for example data segments or functions which are referenced in another ASM file, ie dH.
ASM files are merely text files that can be processed by a compiler called an assembler. They can be opened and edited in any text editor, however it is recommended to use editors with developer functions such as syntax highlighting for easier work.
Each processor architecture has its own machine language and thus also assembly language. In addition, the assembler compilers of a processor architecture sometimes have different syntax. Therefore, with an ASM file, you have to know the architecture and (depending on the architecture) the compiler, in order to be able to compile this file.
Most often resolving problems with opening ASM files is very simple. Just install an appropriate program that supports such files. All of the listed programs support ASM files, but may vary in offered function and purpose. Some programs may be capable only of viewing contents of ASM files or offer file conversion options, but may not be capable of editing such files.
It is possible that although a compatible program has been installed on user’s system, it is not used by the system to open it. This may happen because no default application was associated with this type of files. To associate ASM files with given application, select "Open with" from drop-down menu (accessed by right-clicking on the file). Then select from the list the program or application you want to be used to open this type of file. If the TextMate applications is not on the list, select "Browse" option in order to manually locate the directory where TextMate has been installed.
Sometimes problems with opening ASM files may not lie with the application itself, but can arise due to other causes, such as: