fix file registry that not works on windows

[starccck]

solve issue #2538

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.12 🎉

Comparison is base (894f202) 78.80% compared to head (42a17d1) 78.92%.

❗ Current head 42a17d1 differs from pull request most recent head d222f87. Consider uploading reports for the commit d222f87 to get more accurate results

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2605      +/-   ##
==========================================
+ Coverage   78.80%   78.92%   +0.12%     
==========================================
  Files         631      629       -2     
  Lines       51618    51490     -128     
==========================================
- Hits        40675    40638      -37     
+ Misses       8933     8848      -85     
+ Partials     2010     2004       -6     

Flag	Coverage Δ
go-1.15-386	?
go-1.15-amd64	78.89% <100.00%> (+0.06%)	⬆️
go-1.16-386	78.88% <100.00%> (+0.06%)	⬆️
go-1.16-amd64	78.88% <100.00%> (+0.07%)	⬆️
go-1.17-386	78.86% <100.00%> (+0.05%)	⬆️
go-1.17-amd64	78.88% <100.00%> (+0.07%)	⬆️
go-1.18-386	?
go-1.18-amd64	?

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Impacted Files	Coverage Δ
contrib/registry/file/file.go	100.00% <ø> (ø)
net/gsvc/gsvc.go	66.66% <ø> (ø)
contrib/registry/file/file_discovery.go	69.56% <100.00%> (+0.67%)	⬆️
contrib/registry/file/file_registrar.go	70.00% <100.00%> (+1.03%)	⬆️
net/gsvc/gsvc_endpoint.go	66.66% <100.00%> (ø)

... and 11 files with indirect coverage changes

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