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Windows 7: changing an ".ost"file to open with "unknown" application

12 Aug 2014   #1

windows 7 Ultimate 32 bit
changing an ".ost"file to open with "unknown" application

I changed my outlook email .ost file to open with auto cad by mistake. Initially it was opening with an Unknown application. How can I enable it to open with an unknown application again? please help

My System SpecsSystem Spec
12 Aug 2014   #2

Windows 7 Pro-x64

You can try this tutorial and see if it helps.

Default File Type Associations - Restore
My System SpecsSystem Spec

 changing an ".ost"file to open with "unknown" application

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