| Microsoft EXtended Memory Specification | |
| Microsoft Corporation | |
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XMS file extension was used by some MS-DOS files. MS-DOS is a text-based, command line operating system developed by Microsoft.
XMS files are related to expanded memory technology (access to more than 1 MB of memory) employed in MS-DOS and various conventional memory(first 640 KB of memory space) optimization procedures for running programs in real-time (supported in x86 family of CPUs) and HMA memory access. For technological reasons, the solution is no longer used and considered obsolete.
Windows
Updated 03/26/2022
| .adm | Administrator Policy Template Format |
| .adml | Microsoft Administrative Language-specific XML Template Format |
| .admx | Microsoft Administrative XML Template Format |
| .aml | Microsoft Assistance Markup Language |
| .ani | Animated Cursor |
| .ann | Microsoft Windows Help Annotation Format |
| .aos | Archos Signed Encrypted Data Format |
| .asec | Google Android Encrypted Application Package Format |