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Thank you both. The only problem I found with the original was if I ran it from a bat file in the same folder it would rename it's extension too. Not a big deal though - I'm just happy to have this!

Thanks for the responses everyone. The extension will always be 3 letters/numbers but unfortunately there is no repeating sequence to it (some start with A, F, etc..)

Yes, I would absolutely be fine with the example you proposed (foxidrive):

05273-064.A30.DGN

I'd like to create a bat file which renames files with extensions like: ".A30", ".A31", ".A20", etc... to ".DGN", but the catch is, I'd like the previous extension to be included in the new name. Old Example: 05273-064.A30 New Example: 05273-064A30.DGN I've ru...