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`.xlsm` files are like `.xlxs` files but with macros enabled. They store data in the same XML-based format as `.xlsx` files. Pyexcel will try to use the xlrd package to parse `.xlsm` files. This used to work because xlrd used to support reading `.xlsx` files. xlrd has dropped support for `.xlsx` files in version 2 because of security concerns. This means that when pyexcel asks xlrd to parse a `.xlsm` file it causes an error. This commit adds some branching to force `.xlsm` files to be opened with pyexcel-xlsx instead, which does support `.xlsx` files.