Opening a DFM File

The DFM file type is primarily associated with Delphi.

DFM	File extension: DFM
	File type:	VCL form file

What is a DFM file?

DFM files mostly belong to Delphi by Embarcadero. DFM file format is also used to store display forms created using the Midas ViewPoint software developed by Sentel Advance.

• Main Use: Midas ViewPoint software is an audio-visual display channel player that can affect how information is displayed on screens, DFM files are used by this software to store information related to ViewPoint display objects and related display forms.
• Other Uses: DFM files are also used by Delphi software developed by Borland. Delphi uses DFM files to save object properties. The data in these DFM files can be saved in binary or text format and all this information is finally packaged into a single executable file. C++ Builder, a rapid application development (RAD) environment, also uses DFM files to store form description data. In C++ RAD, the DFM files are sometimes accompanied by a corresponding CPP and H file for other aspects of the form's class. The DFM files can be edited using the Integrated Development Environment (IDE) in C++ Builder.

How to open DFM files

You need a suitable software like Delphi to open a DFM file. Without proper software you will receive a Windows message "How do you want to open this file?" or "Windows cannot open this file" or a similar Mac/iPhone/Android alert. If you cannot open your DFM file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a DFM file directly in the browser:. Just drag the file onto this browser window and drop it.

Online DFM Text Viewer

Choose your .dfm file to analyze

or drag and drop it here

Online File Viewer

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DFM file format:

Why is it important to know the file format? This is the only way to find out which program to use to open the file. The file format can be determined based on the file extension and the signature (the first few characters of a file). Nonetheless, different programs can utilize the same file extension to represent distinct file formats. Double-clicking on the file often results in an error when opening. Exact knowledge of the format is therefore important in order to solve problems occurring in files. Below is our analysis of the DFM files:

You will often come across the DFM file type. This mainly uses a defined DFM format. But the following two file formats are common:

• 70% of all DFM files are associated with Borland Delphi - C. The content consists of readable text data, which can be read using a text editor. The files are 2 KB to 140 KB in size, with a median of 20 KB. The file type was developed 10 years ago and is still in use today. Several words can almost always be found in the files, e.g. object, Left, Top, Caption, Color = clBtnFace, ClientHeight, ClientWidth, BorderStyle and Font.Charset = DEFAULT_CHARSET. Unit1.dfm is a typical file name. Files like these have the following tags: tcwa, form, ustrukspbu and tcda.
• 3% of all DFM files have the same signature 5B 43. If you open these files in a text editor, you can view and read the content yourself. A typical file size is 34 KB. The following keywords are characteristic: Version=1.00, BottomMargin=0, FlagSettings=010111110, LeftMargin=0, OutputFile=output.prn, PageLength=66, PageWidth=80, PrintDevice=LPT1, RightMargin=0, TopMargin=0, [CivilOutput] and [CogoPoints].

All other DFM files (27%) have no consistent format, often, for example, fBa, onnx and TPF. Files like these are sometimes linked to ufpnm, shopping, google, data, dialog, login, model or body. You can get all the details of your DFM file by dragging it onto this page or by clicking the button "Choose your .dfm file to analyze" above.