When using Meteor on Windows, the command "RM" is not identified as either an internal or external command.

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This is because "RM" is a command commonly used on UNIX-based systems and is not recognized by Windows. Instead, you can use the "del" or "rmdir" command to delete files and directories.

For example, to delete a file in the command prompt on Windows, you can use the following command:

del filename.txt

To delete a directory and all its contents:

rmdir /s directoryname

Note that the "/s" flag specifies that the command should also delete any subdirectories within the specified directory.