Baby Names Beginning With "S": Meaning: Three?

Questions

Computers - on "Windows 95/98",what application can you use to see all the files that you have on your computer?

Computers - to erase data or files from your computer is to________?

Computers - to transmit files from a central computer or server to another is called_______?

Computers - what do you call a "file extention" given to "batch files?

Computers - what is the web program "web crawler" used for?