Hello guys these are the some general file extensions.....

.mp3 - MP3 audio file 
.mpa - MPEG-2 audio file 
.wma - WMA audio file 
.wpl - Windows Media Player playlist
 .7z - 7-Zip compressed file 
.arj - ARJ compressed file
 .deb - Debian software package file
 .pkg - Package file
.rar - RAR file
 .z - Z compressed file
 .zip - Zip compressed file
 .apk - Android package file
 .bat - Batch file 
.bin - Binary file
 .cgi or .pl - Perl script file
 .com - MS-DOS command file
 .exe - Executable file 
.gadget - Windows gadget
 .jar - Java Archive file
 .msi - Windows installer package
 .py - Python file 
.wsf - Windows Script File
 .xls - Microsoft Excel file
 .bak - Backup file
 .cab - Windows Cabinet file
 .cfg - Configuration file
 .cpl - Windows Control panel file
 .dmp - Dump file 
.ico - Icon file
 .tmp - Temporary file
 .m4v - Apple MP4 video file
 .doc and .docx - Microsoft Word file 
.txt - Plain text file
 .wpd - WordPerfect document
 sql - SQL database file 
.xml - XML file apk - Android package file
 .bin - Binary file 
.com - MS-DOS command file
 .exe - Executable file
 .gadget - Windows gadget 
.jar - Java Archive file 
.msi - Windows installer package 
css - Cascading Style Sheet file
 .htm and .html - HTML file
 .js - JavaScript file
 .php - PHP file 
.py - Python file
 .rss - RSS file
.xhtml - XHTML file
 .c - C and C++ source code file 
.cpp - C++ source code file
 .cs - Visual C# source code file
 .h - C, C++, and Objective-C header file 
.java - Java Source code file
 mp4 - MPEG4 video file
 doc and .docx - Microsoft Word file
 .pdf - PDF file 
.txt - Plain text file

hope you got some knowledge about the file extensions

keep supporting our website 

thankyou...