There and many different extensions used for graphics files as there are many different formats of graphic file. There are many formats because there are many uses of graphics and the formats all have benefits and drawbacks for different uses, some are very high quality but take a lot of space, others are smaller but poorer quality, some allow different 'layers' with the pictures to be edited separately, etc, etc.
BMP - Windows Paint simple to use format, good quality but large files.
CLP - Clip Art for including in drawings, documents etc.
CHT, CH3, PR4 - Harvard Graphics presentation graphics.
JPEG, JPG or JPE - a very common format frequently used for photographs. Allows for compression to save on file size but high compression results in loss of quality.
GIFF - commonly used for internet graphics, eg on websites. Reasonable quality, compression. Originally created by Compuserve).
PCX - an oldish format, good for clip art
PCD - format used on commercially produced Photo CD's
PSD - Adobe Photoshop file. High quality and layers can be edited, large files.
RAW - raw graphics file produced by digital camera's
TGA or VGA - Targa (don't know anything about it!)
WPG - Word Perfect Graphic, used by the Word Perfect Corporation.
There are a few more, but these are the most common ones. Hope that helps.
The program filename for File Explorer in Windows is "explorer.exe." It is the executable file that allows users to navigate files and folders on their system. The extension ".exe" indicates that it is a Windows executable file.
file extension
.bat indicates a batch file, which is a script. You can see what it contains by opening it with a text editor, such as notepad.
A file name that identifies the file's type and indicates the application that created it typically includes a file extension, which is a suffix added to the base name of the file, preceded by a dot. For example, a file named "document.docx" indicates that it's a Microsoft Word document. The ".docx" extension specifies the file type and suggests the application used to create it. Other examples include ".xlsx" for Excel spreadsheets and ".jpg" for image files.
PHP code can be stored in any kind of file -- the extension of the file indicates what said file contains, but may not necessarily be true. The "php" extension is used to indicate PHP which is meant for execution and presentation.
A compiled Help File in Windows will have the extension .chp
There is list of programs that support DO file extension http://www.howopen.org/en/extensions/web-files/do
A file that has .xls, .xlsx, .xlsm as file extension then it is known as excel file.
A file with the extension ".exe" is most likely to contain malicious code. This extension indicates an executable file, which can run programs on your computer. Malicious actors often use executable files to deliver harmful software such as viruses, trojans, or ransomware. It is important to exercise caution when opening files with the ".exe" extension, especially if they are from unknown or untrusted sources.
file extension
The main project file has a VBPROJ extension. This is also a file with the same name as the main project file, but with an SLN extension. The SLN extension is a solution file.
There is no specific file extension for MS-DOS. Files can have any 3 character extension in MS-DOS.