Where DTS packages are stored?

> I receive and error "The DTS Host failed to load or save the package properly" everytime i open all my DTS File . I could only remeber installing Win2003sp1 then again I cannot open my DTS file. Im not so sure if SP1 is the cause since I also experience this before w/o sp1.
>So I reintall SQL Server and re-apply SQL Sp4. I still receive the error. I also search support.microsoft.com if it is a bug it nothing in there. And late I try to test the DTS on my other machine and indeed it open. Have anybody tried this? I have link of screen shot below
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>http://nosij.tripod.com/dts.jpg
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>Thanks