Merchants were granted a second extension late Tuesday for filing claims against Visa Inc. and Mastercard Inc. in their ongoing class-action lawsuit against the two networks over interchange costs.

Ever got stuck with a file that has some mysterious extension? Where no matter how much you try, the Jigsaw puzzle doesn’t seem to fit together? So, for instance, if the file has the extension ...

A file extension, or file name extension, is the letters immediately shown after the last period in a file name. For example, the file extension.txt has an extension of .txt. This extension allows the ...