| File Extension: | HMK |
| File Type Description: | Hallmark Card Studio File |
| File Type Developer: | Hallmark Cards, Inc. |
| Primary Associated Software: | Hallmark Card Studio |
| Primary Software Developer: | Hallmark Cards, Inc. |
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Hallmark Card Studio is the primary software program that utilizes the Hallmark Card Studio File file, originally developed by Hallmark Cards, Inc.. Internal website statistics show that HMK files are most popular with users in China and those running the Windows 10 operating system. In most cases, these users are surfing the internet using the Google Chrome browser.
 | Hallmark Card Studio by Hallmark Cards, Inc. |
| Windows 10 | Windows 11 | Windows 6 | Windows 8.1 |
 | Windows |
 | Mac |
| Extension | File Type Developer | File Category | File Type Description |
|---|---|---|---|
| .RB4 | Sarm Software | Page Layout Files | Resume Builder 4 File |
| .MFT | Kaspersky Lab | Data Files | Kaspersky File Table |
| .OMP | MatchWare | Page Layout Files | OpenMind Windows Document |
| .BCF | Belltech systems | Page Layout Files | Business Card Designer Pro File |
| .DCX | ZSoft Corporation | Raster Image Files | Zsoft Multi-Page Paintbrush File |
| .PMI | David Harris | Page Layout Files | Pegasus Mail Folder Index |
| .RPTR | Open Source | Page Layout Files | RafflePrinter Document |
| .PFL | PlotSoft | Page Layout Files | PDFill Project File |
| .ADB | Open Source | Developer Files | Ada Body File |
| .LST | Unknown Developer | Text Files | Data List |
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