Executable Files Extensions - What are executable files and how do I open a executable file?

What are executable files and how do I open a executable file?

File Type Category File Format
.btm Executable Files 4DOS Batch File
.ear Executable Files Java Enterprise Archive File
.fxp Executable Files FoxPro Compiled Program
.ipf Executable Files SMS Installer Script
.phar Executable Files PHP Archive
.pif Executable Files Program Information File
.run Executable Files Linux Executable File
.wpm Executable Files WordPerfect Macro File
.xbe Executable Files Xbox Executable File