| File Extension: | XCMD |
| File Type Description: | HyperCard External Commands |
| File Type Developer: | Bill Atkinson |
| Primary Associated Software: | HyperCard |
| Primary Software Developer: | Bill Atkinson |
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Bill Atkinson developed the HyperCard External Commands file type when the HyperCard was initially released. Visitor data analysis shows that these HyperCard External Commands files are typically seen on Windows 10 user machines from United States. Google Chrome is the predominant internet browser used by this population.
 | HyperCard by Bill Atkinson |
| Windows 10 | Windows 11 | Windows 6 | Windows 8.1 |
 | Apple II |
 | Macintosh |
| Extension | File Type Developer | File Category | File Type Description |
|---|---|---|---|
| .OBR | Micro Focus International plc | Developer Files | Borland C++ Object Browser Data |
| .DDD | Alpha Software | Developer Files | Alpha Five Data Dictionary File |
| .FPC | Microsoft Corporation | Data Files | FoxPro Catalog Memo |
| .SRC | Unknown Developer | Developer Files | Source Code File |
| .CV4 | Microsoft Corporation | Developer Files | Microsoft CodeView Graphics Data |
| .UCLS | ObjectAid | Developer Files | ObjectAid UML Explorer Class Diagram |
| .AU3 | Jonathan Bennett | Developer Files | AutoIt V3 Script |
| .JLC | GNOME | Developer Files | Byte Compiled Lisp-Based Script File |
| .DML | Sybase, Inc | Web Files | DynaScript File |
| .IJS | Open Source | Developer Files | J Interpretor Script |
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