Fix file open check (#98) #224

Job	Run time
Code formatting	8s
Exercise Python examples on ubuntu-latest	1m 36s
Check Ruby Samples ubuntu-latest	2m 1s
Exercise Python examples on macos-latest	4m 32s
Check Ruby Samples macos-latest	3m 42s
Build Windows fetch	4m 52s
Build ubuntu-20.04 gcc os	2m 14s
Build Windows vcpkg	7m 5s
Build ubuntu-20.04 gcc fetch	1m 33s
Build ubuntu-20.04 gcc vcpkg	4m 35s
Build ubuntu-20.04 clang os	2m 17s
Build ubuntu-20.04 clang fetch	3m 26s
Build ubuntu-20.04 clang vcpkg	7m 33s
Build macos-latest gcc os	3m 11s
Build macos-latest gcc fetch	4m 9s
Build macos-latest gcc vcpkg	3m 10s
Build macos-latest clang os	3m 26s
Build macos-latest clang fetch	3m 44s
Build macos-latest clang vcpkg	3m 54s
	1h 7m 8s

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