  We use a combined analysis of the semileptonic and leptonic branching ratios
of the D mesons to constrain scalar leptoquark interactions and charged
higgs-like interactions. For the THDM type II, we found that a low mass 6.3GeV
< m_{H^+} < 63.1GeV for the charged Higgs is favored at 90% C.L. although at
95% there is still agreement with other constraints. We find for the leptoquark
states a more restrictive bound than previous analysis.
