fix(getMimetype): Check x-msi by an extension

[AndrzejSala]

No description provided.

[codecov]

Codecov Report

Merging #280 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #280      +/-   ##
==========================================
+ Coverage   99.04%   99.05%   +<.01%     
==========================================
  Files          32       32              
  Lines        1472     1474       +2     
  Branches      272      272              
==========================================
+ Hits         1458     1460       +2     
  Misses         14       14

Impacted Files	Coverage Δ
src/lib/utils/index.ts	100% <100%> (ø)	⬆️
src/index.ts	100% <100%> (ø)	⬆️

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