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These settings allow you to specify a description and the application to launch to view files with an unknown extension.

Open your registry and find the key below.

Set the "(Default)" value to equal the description you want to use for unknown file types.

Create a new sub-key called [HKEY_CLASSES_ROOT\Unknown\shell\Open\Command] and set the "(Default)" value to equal the command used to view unknown file types. Substitute the symbol "%1" to represent the filename in the command (e.g. "notepad.exe %1").

Restart Windows for the change to take effect.

(Default) REG_SZ Unknown File Type

HKEY_CLASSES_ROOT\Unknown

Registry Settings

System Key: [HKEY_CLASSES_ROOT\Unknown]

Value Name: (Default)

Data Type: REG_SZ (String Value)