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Yes, OpenMP is supported by Rtools in Windows R. Rtools provides the necessary compilers and libraries for OpenMP in R on Windows. To use OpenMP in R on Windows, you need to add the compiler flag for OpenMP (-fopenmp) in the Makevars file. This file can be located in the ~\Documents.R\ folder. Then, you can use the parallel programming functions in R to parallelize your code using OpenMP.