Solve : Windows 98 Corrupt .dat files?

1.	Solve : Windows 98 Corrupt .dat files?
Answer» My OS is win 98 All my .dat files are being opened with a Cstudio PROGRAM. The program has NEVER been installed or used on my pc. Checked Microsoft Site, the only thing even CLOSE was- win 3x regedit help. Any suggestions? run a spyweeper/ trojan/worm program....if this still does it come back..

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