What is a DF1 file?
A .DF1 file is a database file used by several database management systems. The most common use is a DataFlex database file created by software from Data Access Worldwide. These files store structured data records for business applications. Another common format is the Omnis Native Datafile, which acts as a database container for Omnis7 applications, originally managed by Raining Data. Because .DF1 files can be used by different applications, they can have completely different internal structures.
How to open DF1 files?
Opening a .DF1 file requires the correct software. If it is a DataFlex file, you need the DataFlex Studio or standard database administration tools configured for DataFlex. If the file is an Omnis Native Datafile, you need the Omnis Studio environment. Because these are proprietary database formats, you usually cannot open them with standard text editors without seeing scrambled data.
Best practices and troubleshooting
The biggest problem with a .DF1 file is knowing which database system created it. You should always look at the other files in the same folder. DataFlex files often appear next to .DAT, .HDR, or .K1 files. Omnis files might be standalone or next to .LBR library files. Do not modify the file in a text editor, or you might corrupt the database index.
Inspecting with viewer.online
Because a .DF1 file can be a DataFlex file, an Omnis Native Datafile, or a Dataform database, viewer.online/df1 is the best way to start. The viewer can analyze .DF1 files to identify the exact format and creator software. It allows you to inspect the file structure, extract readable text, and check whether an online preview is available.
Summary
viewer.online/df1 is useful for identifying, inspecting, and understanding .DF1 files without installing software or dealing with compatibility problems. It helps you quickly determine if you need DataFlex or Raining Data software to fully read your data.