| File Extension: | ER1 |
| File Type Description: | ERWin Entity Relationship Diagram |
| File Type Developer: | CA Technologies |
| Primary Associated Software: | ERwin |
| Primary Software Developer: | CA Technologies |
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ERWin Entity Relationship Diagram files were originally developed by CA Technologies for the ERwin software application. User statistics infer that these ER1 files are popular with users from United States and most frequently found on the Windows 10 platform. Google Chrome is the predominant internet browser used by this population.
 | Visible Advantage by Visible Systems |
 | ERwin by CA Technologies |
| Windows 10 | Windows 11 | Windows 6 | Windows 8.1 |
 | Windows |
| Extension | File Type Developer | File Category | File Type Description |
|---|---|---|---|
| .ERI | XnSoft | Raster Image Files | ERI-chan (Entis Rasterized Image) Image Format |
| .RLZ | CA Technologies | Data Files | Basic CA-Realizer File |
| .PPO | CA Technologies | Uncommon Files | CA Clipper Preprocessor Output |
| .BK1 | Autodesk, Inc. | Backup Files | Autodesk Backup File |
| .FST | Image-Line | Settings Files | FL Studio State File |
| .ERWIN | CA Technologies | Data Files | ERwin Data Modeler Model |
| .RMK | Grafx Software Development Tools | Data Files | CA Clipper RMake Makefile |
| .PRG | Open Source | Executable Files | Program File |
| .XQT | CA Technologies | Executable Files | SuperCalc Macro File |
| .DBF | dBase, LLC | Database Files | Database File |
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