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msvcr100.dll is a part of Microsoft Visual C++ and is required to run programs developed with Visual C++.
Some games or applications may need the file in the game/application installation folder. Copying it from C:\Windows\System32 to the installation of the game/application should fix that problem.
Possible errormessages regarding this file:
"msvcr100.dll Not Found"'
"The file msvcr100.dll is missing"
"File msvcr100.dll not found"
"msvcr100.dll not found. Reinstalling might help fix this."
If it for some reason doesn't work by just replacing the file, you might need to reinstall the Microsoft visual C++ 2010 Redistributable package. That can be found here: