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Visual Studio 2010 Project Error AssemblyInfo.cs could not be opened



So you open a project in Visual Studio 2010 and get an odd error:
Source file '<Project Location>\Properties\AssemblyInfo.cs' could not be opened ('Unspecified error')
What this means is that the AssemblyInfo.cs file is either missing
from the Properties folder in the project or there is a permissions issue. If
 ermissions, update the ACL (File > Properties > Security), close and re-open the project. If missing altogether, you just need to recreate it using
the following steps:

  1. Within Visual Studio 2010, select Tools > Create GUID
  2. Click Copy (or New GUID then
    Copy)
  3. Click Exit
  4. Expand the Properties folder in the Solution Explorer (Control + W, S to open)
  5. Delete the AssemblyInfo.cs file shown with the exclaimation point
  6. Double click on the Properties folder - this should open the Properties window
  7. On the Application Tab, click the Application Information... button
  8. Fill in the application information, paste the GUID you copied into the GUID
    field - when done click OK
problem solved...
One FYI - if the project requires a specific GUID, you can set it - if not known, you have no choice but to create one.


source: http://davidmsterling.blogspot.com/2011/05/visual-studio-2010-project-error.html

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