COM file
In DOS, the COM file was a simple type of executable file with the file name extension .com (not to be confused with the .com top-level domain.) The format is still executable on modern Windows-based platforms, but it is run in an MS-DOS-emulating subsystem.
The format is perhaps the simplest executable format of all; it contains no metadata, only code and data, and is loaded at address 100h of some segment and executed. Because of how the segmentation model works, there's no need for relocation. Its simplicity exacts a price, however: the binary has a maximum size of 65280 (FF00h) bytes and stores all its code and data in one segment; this is why it fell into disuse quickly. Many shell utilities such as MS-DOS more used this format, as well as small, early applications such as the IBM game Alleycat.
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