To convert a DAT file, enable the file extension display in the Folder Options window, and change the extension to fit the desired format. Alternatively, use an online conversion service such as Winmaildat.com or Online-Convert.com, select the desired output format, and perform a conversion.
To make the file extensions visible, open Windows Explorer by accessing any folder, click on the Organize button, and then click on Folder and Search Options entry in the drop-down menu. In the Folder Options windows, open the View tab, uncheck the box next to the Hide Extensions for Known File Types option, and click OK. To modify the extensions, click on the DAT file, press F2, mark the .dat extension, and type the desired format. For example, type ".doc" or ".docx" for text files and ".png" for images. This only works if the DAT file contains information of the same type as the selected format.
To convert a DAT file through an online conversion service, navigate to Online-Convert.com, click on File Formats in the navigation menu, click on the DAT link in the Misc File Formats section, and select the desired output format. Upload the DAT file by clicking on the Choose Files button and selecting it, modify the output format parameters if necessary, and click on the Convert File button. Once the conversion process completes, click on the provided download link to acquire the converted version.