The file extension DIB stands for device independent bitmap, ie a device-independent image format and represents a rarely used alternative extension to bmp (Windows BitMaP). However, DIB and bmp files differ in that bmp images can contain additional information in the so-called BMP header.
The DIB format offers only a weak compression with RLE, which is why the files are usually quite large. If a graphic program or indicator does not support the file extension DIB, changing it to bmp can usually help. Therefore, DIB files can in principle be opened with any program that supports bmp.
Most often resolving problems with opening DIB files is very simple. Just install an appropriate program that supports such files. All of the listed programs support DIB files, but may vary in offered function and purpose. Some programs may be capable only of viewing contents of DIB files or offer file conversion options, but may not be capable of editing such files.
It is possible that although a compatible program has been installed on user’s system, it is not used by the system to open it. This may happen because no default application was associated with this type of files. To associate DIB files with given application, select "Open with" from drop-down menu (accessed by right-clicking on the file). Then select from the list the program or application you want to be used to open this type of file. If the Adobe Photoshop applications is not on the list, select "Browse" option in order to manually locate the directory where Adobe Photoshop has been installed.
Sometimes problems with opening DIB files may not lie with the application itself, but can arise due to other causes, such as: