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conan install mingw-w64/8.1@ --build=mingw-w64 --profile=C:\J\w\BuildSingleReference/28734/93e1d88c-f723-431d-b331-ce13458a7cce/profile.txt
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Configuration:
[settings]
arch=x86_64
arch_build=x86_64
build_type=Release
compiler=Visual Studio
compiler.runtime=MT
compiler.version=14
os=Windows
os_build=Windows
[options]
[build_requires]
[env]

mingw-w64/8.1: Forced build from source
Installing package: mingw-w64/8.1
Requirements
    mingw-w64/8.1 from local cache - Cache
Packages
    mingw-w64/8.1:6903a9d1b48b06f7fbe0929db654512c77e6cc32 - Build

Installing (downloading, building) binaries...
[HOOK - conan-center.py] pre_source(): [IMMUTABLE SOURCES (KB-H010)] OK
mingw-w64/8.1: Configuring sources in C:\J\w\BuildSingleReference\.conan\data\mingw-w64\8.1\_\_\source
mingw-w64/8.1: Downloading: http://sourceforge.net/projects/mingw-w64/files/Toolchains%20targetting%20Win64/Personal%20Builds/mingw-builds/8.1.0/threads-posix/seh/x86_64-8.1.0-release-posix-seh-rt_v6-rev0.7z


----Running------
> 7z x file.7z
-----------------
mingw-w64/8.1: WARN: Build folder is dirty, removing it: C:\J\w\BuildSingleReference\.conan\data\mingw-w64\8.1\_\_\build\6903a9d1b48b06f7fbe0929db654512c77e6cc32
mingw-w64/8.1: WARN: Trying to remove corrupted source folder
mingw-w64/8.1: WARN: This can take a while for big packages
'7z' is not recognized as an internal or external command,
operable program or batch file.
ERROR: mingw-w64/8.1: Error in source() method, line 43
	self.run("7z x file.7z")
	ConanException: Error 1 while executing 7z x file.7z