Office File Validation detected a problem

Problem: "Opening it may be dangerous" message while opening excel file

The cause for this error is new Microsoft Office feature.

Document can be opened
however to turn off this message:

you must create new values in registry editor so it looks like in picture above:
for office 2003:

start - run - cmd -
regedit -
HKEY_CURRENT_USER\Software\Policies\Microsoft\
Office\11.0\Excel>\Security\FileValidation
Value: EnableOnLoad
Type: DWORD

• 0 = Don’t validate

• 1 = Validate

• 2 = Validate unless called via object model
  

Explanation and Solution:
http://technet.microsoft.com/en-us/library/gg985445%28office.12,printer%29.aspx