I'm wondering how you pronounce file extensions. You don't need to read the file descriptions because it would be a bit tough. Thanks!
http://www.fileinfo.com/common.php
Common File Extensions
Text Files
.doc Microsoft Word Document
.docx Microsoft Word Open XML Document
.log Log File
.msg Outlook Mail Message
.pages Pages Document
.rtf Rich Text Format File
.txt Plain Text File
.wpd WordPerfect Document
.wps Microsoft Works Word Processor Document
Data Files
.blg Windows Binary Performance Log File
.csv Comma Separated Values File
.dat Data File
.efx eFax Document
.key Keynote Presentation
.pps PowerPoint Slide Show
.ppt PowerPoint Presentation
.pptx PowerPoint Open XML Presentation
.sdf Standard Data File
.vcf vCard File
.xml XML File
Audio Files
.aac Advanced Audio Coding File
.aif Audio Interchange File Format
.iff Interchange File Format
.m3u Media Playlist File
.mid MIDI File
.mp3 MP3 Audio File
.mpa MPEG-2 Audio File
.ra Real Audio File
.wav WAVE Audio File
.wma Windows Media Audio File
Video Files
.3g2 3GPP2 Multimedia File
.3gp 3GPP Multimedia File
.asf Advanced Systems Format File
.asx Microsoft ASF Redirector File
.avi Audio Video Interleave File
.flv Flash Video File
.mov Apple QuickTime Movie
.mp4 MPEG-4 Video File
.mpg MPEG Video File
.rm Real Media File
.swf Flash Movie
.vob DVD Video Object File
.wmv Windows Media Video File
3D Image Files
.3dm Rhino 3D Model
.max 3ds Max Scene File
Raster Image Files
.bmp Bitmap Image File
.gif Graphical Interchange Format File
.jpg JPEG Image File
.png Portable Network Graphic
.psd Adobe Photoshop Document
.pspimage PaintShop Photo Pro Image
.thm Thumbnail Image File
.tif Tagged Image File
.yuv YUV Encoded Image File
Vector Image Files
.ai Adobe Illustrator File
.drw Drawing File
.eps Encapsulated PostScript File
.ps PostScript File
.svg Scalable Vector Graphics File
Page Layout Files
.indd Adobe InDesign Document
.pct Picture File
.pdf Portable Document Format File
.qxd QuarkXPress Document
.qxp QuarkXPress Project File
.rels Open Office XML Relationships File
Spreadsheet Files
.wks Works Spreadsheet
.xls Excel Spreadsheet
.xlsx Microsoft Excel Open XML Spreadsheet
Database Files
.accdb Access 2007 Database File
.db Database File
.mdb Microsoft Access Database
.pdb Program Database
.sql Structured Query Language Data
Executable Files
.app Mac OS X Application
.bat DOS Batch File
.cgi Common Gateway Interface Script
.com DOS Command File
.exe Windows Executable File
.jar Java Archive File
.pif Program Information File
.vb VBScript File
.wsf Windows Script File
Game Files
.gam Saved Game File
.nes Nintendo (NES) ROM File
.rom N64 Game ROM File
.sav Saved Game
CAD Files
.dwg AutoCAD Drawing Database File
.dxf Drawing Exchange Format File
.pln ArchiCAD Project File
GIS Files
.gpx GPS Exchange File
.kml Keyhole Markup Language File
Web Files
.asp Active Server Page
.cer Internet Security Certificate
.csr Certificate Signing Request File
.css Cascading Style Sheet
.htm Hypertext Markup Language File
.html Hypertext Markup Language File
.js JavaScript File
.jsp Java Server Page
.php Hypertext Preprocessor File
.rss Rich Site Summary
.xhtml Extensible Hypertext Markup Language File
Plugin Files
.8bi Photoshop Plug-in
.plugin Mac OS X Plug-in
.xll Excel Add-In File
Font Files
.fnt Windows Font File
.fon Generic Font File
.otf OpenType Font
.ttf TrueType Font
System Files
.cab Windows Cabinet File
.cpl Windows Control Panel
.cur Windows Cursor
.dll Dynamic Link Library
.dmp Windows Memory Dump
.drv Device Driver
.lnk File Shortcut
.sys Windows System File
Settings Files
.cfg Configuration File
.ini Windows Initialization File
.keychain Mac OS X Keychain File
.prf Outlook Profile File
Encoded Files
.bin Macbinary Encoded File
.hqx BinHex 4.0 Encoded File
.mim Multi-Purpose Internet Mail Message File
.uue Uuencoded File
Compressed Files
.7z 7-Zip Compressed File
.deb Debian Software Package
.gz Gnu Zipped Archive
.pkg Mac OS X Installer Package
.rar WinRAR Compressed Archive
.sit Stuffit Archive
.sitx Stuffit X Archive
.tar.gz Tarball File
.zip Zipped File
.zipx Extended Zip File
Disk Image Files
.dmg Mac OS X Disk Image
.iso Disc Image File
.toast Toast Disc Image
.vcd Virtual CD
Developer Files
.c C/C++ Source Code File
.class Java Class File
.cpp C++ Source Code File
.cs Visual C# Source Code File
.dtd Document Type Definition File
.java Java Source Code File
.m Objective-C Implementation File
.pl Perl Script
Backup Files
.bak Backup File
.gho Norton Ghost Backup File
.ori Original File
.tmp Temporary File
Misc Files
.dbx Outlook Express E-mail Folder
.msi Windows Installer Package
.part Partially Downloaded File
.torrent BitTorrent File
For a large portion of these you would just read it "dot" then follow with saying each individual letter. ^^