Unable to open Silverlight

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After my CPU re-setup, I could not open my SL projects. It warns me to install the latest SL Developer (download at go.microsoft.com/fwlink/?LinkId=146060), which was actually installed already. My SL project was developed in SL 4. Please advise me how to solve this problem. Thanks.
Every time I have a CPU system change, I have a headache in fixing the SL related problem(s). I do wish Microsoft Developer Team realizes on it.

Posted 27-Dec-13 6:16am

Member 10454592

Updated 27-Dec-13 6:26am

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Member 10454592 · Accepted Answer · 2013-12-31T03:08:00

Problem solved by the procedure below:
1) Have the following items installed / re-installed
• SL 3 SDK
• SL 4 Toolkit April 2010
• MS Expression Blend SDK for SL 4
• SL Developer
2) Refer to http://community.dynamics.com/crm/b/crminogic/archive/2012/09/20/how-to-convert-silverlight-4-application-to-silverlight-5.aspx, Step 3: Open the .csproj file
3) Change
<targetframeworkversion>v5.0
From V5.0 to 4.0.
4) Reload the file.