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Install notepad++, and open the bibfile.
search -> find -> replace
under search mode choose “Regular expression”
find and replace with the following search string:


Where  url|annote|file|abstract|doi|issn|month  denotes what entries is deleted.


Removing Abstract field from BibTeX


NOTE: Replace with field should be empty (no space).
Then just hit Replace All button.

You are welcome 😀

Original idea: Søren Roesgaard Nielsen