Please compare the two pictures below:

1. The default (correct) one:

2. The defected one that causes the problem:

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If that's the reason .....ha, it will be easy to solve:

1. Open the 'Registry Editor' of your Win 7,

2. To the location:

HKEY_CLASSES_ROOT\lnkfile

3. Choose 'lnkfile', and find whether there is a 'String Value' named 'IsShortCut' on the right colume.

4. If there exists not that 'String Value' named 'IsShortCut', please create one.

5. That's it.

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I sincerely hope the above iformation helps. If you cannot fix the problem with this way,

I'll be bewildered, too.