Windows 10 rename multiple files in a batch script to a new extension keeping the old extension as part of name

[pokjohn]

I want to rename a file with a new extension but keep the exiting extension as part of the new file name. Example xxxxxx.xxx.xxx.f000 rename to xxxxxx.xxx.xxx.f000.123."ren * *.123" just replaces the .f000 with .123.I want to keep the .f000 as part of the new filename.The current files have multiple extensions in sequence, .f000, .f003, .f006, etc.

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