| 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 China 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 |
|---|---|---|---|
| .DNA | GSL Biotech LLC | Data Files | SnapGene DNA File |
| .XQT | CA Technologies | Executable Files | SuperCalc Macro File |
| .CH | CA Technologies | Developer Files | Clipper Include File |
| .PRG | Open Source | Executable Files | Program File |
| .RLL | Microsoft Corporation | Settings Files | Microsoft Resource Library |
| .RMK | Grafx Software Development Tools | Data Files | CA Clipper RMake Makefile |
| .AJL | CA Technologies | Backup Files | ARCserve Backup Journal File |
| .DBF | dBase, LLC | Database Files | Database File |
| .BK1 | Autodesk, Inc. | Backup Files | Autodesk Backup File |
| .VET | Lectra | CAD Files | Lectra Cutter's Must File |
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