Motorola (MOT) has accused a former chief financial officer of deleting files from a company laptop after he'd been dismissed from the firm.According to The Associated Press, a filing in a county court in Chicago said Motorola has accused former CFO Paul Liska of returning a company laptop after running a data destruction program and not backing up the files. An affidavit states that Liska requested only his email be backed up. Motorola wants Liska to be ordered to surrender all other computers and storage media. Liska was fired for "serious misconduct and incompetence" and he planned a "scheme designed to portray himself as a whistleblower and demand millions in return for his silence," Motorola said in documents that were posted on the Chicago Tribune's Web site last week. Liska contends that he left the company as a result of "retaliatory discharge," and that Motorola sought to harm his reputation in response to him "raising legitimate concerns" about Motorola's cell phone unit, according to the AP. He sued Motorola Feb. 20, a day after being fired "for cause," as Motorola characterized the move. Investors didn't seem to mind the day's drama. Motorola shares ended the day up 4.1% to $4.87, while its rivals got stuck in the red: Nokia ( NOK) fell 3.2% to $13.36. Research In Motion ( RIMM) fell 0.5% to $63.90. iPhone maker Apple ( AAPL) fell 0.6% to $117.64. Palm ( PALM) fell 1.4% to $9.22.