It is possible in Open Office what u want exactly…..
Open Writer / Calc > File > Recent Documents ( 3rd option of File Menu, here u may see ur last modified files. it keeps 10 files maximum)
In MS Office it is possible to reduce / increase the file nos from Tools> Options > General but If u want to change the no of files in Open Office then u have to run a macro which is down loadable from site and it is under GPL then run this macro to customize as ur requirements. I mention the URL where u can get the macros (http://sourceforge.net/projects/ooomacros/files/) and the macro is in a .zip format just unzip this and double click the file called “RecentFilesListChanger-2003-12-30-01.sxd” and run to customize as ur choice.
Bye and hope it will work 4 u.
In windows, you can right-click the file, select “Open with..” and choose a program to open that file. There is also an option to make that program the default for that file type..