for /l %A in (1,1,100) do copy "C:\some folder\file.ext" "C:\some folder\file-%A.ext"
See for /?
In the batch file, use %%A , not %A on the command line.
FOR /L %variable IN (start,step,end) DO command [command-parameters] The set is a sequence of numbers from start to end, by step amount. So (1,1,5) would generate the sequence 1 2 3 4 5 and (5,-1,1) would generate the sequence (5 4 3 2 1)
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