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How to solve "Error when loading XML definition file" error while launching Unity Pro 8.0 on Windows 7 64 bit platform.

Unity XL V8.0 on Windows 7 64 bit must re-register the msxml4.dll file in the Windows registry. 
This dll is located in the \ windows \ SysWOW64 directory. 
To register the file do below steps :-
Click the Start Menu tab in windows 7



 Type regsvr32 c: \ windows \ SysWOW64 \ msxml4.dll
 Click OK to register dll file and this will solve the problem.
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