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From Memory Alpha, the free Star Trek reference

Micro-charges were a type of explosive possessed by Ferengi merchant, Ulis, during the mid-22nd century.

When the Ferengi raiders who raided Enterprise NX-01 in 2151 believed they had discovered the ship's vault, which was actually sickbay's imaging scanner, it was suggested that they use micro-charges to blow it open, as a means of circumventing what they believed to be a magnetic seal. (ENT: "Acquisition")