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http://www.xfutureblog.com/2007/09/27/how-to-reduce-or-compress-avi-file-size-and-upload-to-youtube/
It is called Compress.
File compression
The file extension for Microsoft Access 2007 is '.accdb'.
File Compression
Save PPT 2007 file as .ppt format
MS Excel is a spreadsheet program that creates files called workbooks.
open file in excel 2007 then press ribbon and go to Save as, you will see Excel 1997-2003 Workbook option, click on it and save file.
Microsoft Word 2007 file.
Open this file in Word 2007.
Using compression.
Human File 752 - 2007 was released on: USA: 19 September 2007 (48 to Life)