What works:
- python-3.7.9.exe  python-3.8.9.exe

What fails:
- python-3.10.0b2.exe  python-3.9.5.exe

(I'm debugging some regressions on my test suite… macOS and Linux [incl. in Docker] work, Windows fails)

How to reproduce (macOS):
0. Install WINE (crossover) https://github.com/Gcenx/homebrew-wine#how-to-install-using-brew
1. wine python-<version>.exe /quiet /passive /log c:/p.log TargetDir=C:/python-<version> InstallAllUsers=1 Include_doc=0 Include_debug=0 Include_dev=0 Include_exe=1 Include_launcher=0 Include_lib=1 Include_pip=1 Include_symbols=0 Include_tcltk=0 Include_test=0 Include_tools=0
2. curl https://bootstrap.pypa.io/get-pip.py -o http://get-pip.py
3. wine "C:\\python-<version>\\python.exe" http://get-pip.py

(replacing `<version>`; obviously)

Error:
```
000b:fixme:thread:create_user_shared_data_thread Creating user shared data update thread.
000d:fixme:thread:create_user_shared_data_thread Creating user shared data update thread.
0010:fixme:thread:create_user_shared_data_thread Creating user shared data update thread.
0017:fixme:thread:create_user_shared_data_thread Creating user shared data update thread.
001d:err:plugplay:process_IOService_Device object 0x9203
001d:err:plugplay:process_IOService_Device Unable to create plug in interface for USB deviceobject 0x9207
001f:fixme:thread:create_user_shared_data_thread Creating user shared data update thread.
0009:fixme:heap:RtlSetHeapInformation 0x0 1 0x0 0 stub
0025:fixme:thread:create_user_shared_data_thread Creating user shared data update thread.
0009:fixme:ntdll:NtQueryInformationToken QueryInformationToken( ..., TokenElevation, ...) semi-stub
0009:fixme:ntdll:NtQueryInformationToken QueryInformationToken( ..., TokenElevation, ...) semi-stub
0009:fixme:advapi:DecryptFileW (L"C:\\windows\\Temp\\{FDB2F91C-29EE-4A75-AAA5-39F402CF12ED}\\", 00000000): stub
002b:fixme:heap:RtlSetHeapInformation 0x0 1 0x0 0 stub
002b:fixme:ntdll:NtQueryInformationToken QueryInformationToken( ..., TokenElevation, ...) semi-stub
002b:fixme:ntdll:NtQueryInformationToken QueryInformationToken( ..., TokenElevation, ...) semi-stub
002b:fixme:advapi:DecryptFileW (L"C:\\windows\\Temp\\{3F224591-5EEC-4431-8291-2450B9ECC110}\\", 00000000): stub
002e:fixme:shell:SHAutoComplete stub
002b:fixme:ver:GetCurrentPackageId (0x31fd04 0x0): stub
0009:fixme:ver:GetCurrentPackageId (0x31fd04 0x0): stub
```

Expected (`uniq` output of a successful install of 3.8):
```
000b:fixme:thread:create_user_shared_data_thread Creating user shared data update thread.
000d:fixme:thread:create_user_shared_data_thread Creating user shared data update thread.
0010:fixme:thread:create_user_shared_data_thread Creating user shared data update thread.
0017:fixme:thread:create_user_shared_data_thread Creating user shared data update thread.
001d:err:plugplay:process_IOService_Device object 0x6a03
001d:err:plugplay:process_IOService_Device Unable to create plug in interface for USB deviceobject 0x6a07
001f:fixme:thread:create_user_shared_data_thread Creating user shared data update thread.
0009:fixme:heap:RtlSetHeapInformation 0x0 1 0x0 0 stub
0025:fixme:thread:create_user_shared_data_thread Creating user shared data update thread.
0009:fixme:ntdll:NtQueryInformationToken QueryInformationToken( ..., TokenElevation, ...) semi-stub
0009:fixme:advapi:DecryptFileW (L"C:\\windows\\Temp\\{86717C64-3933-4B4D-9283-CEA5CD0F5EBB}\\", 00000000): stub
002b:fixme:heap:RtlSetHeapInformation 0x0 1 0x0 0 stub
002b:fixme:ntdll:NtQueryInformationToken QueryInformationToken( ..., TokenElevation, ...) semi-stub
002b:fixme:advapi:DecryptFileW (L"C:\\windows\\Temp\\{9A024DD0-BF6A-4DF1-A034-C61E89E6F711}\\", 00000000): stub
002e:fixme:shell:SHAutoComplete stub
002b:fixme:advapi:DecryptFileW (L"C:\\windows\\Temp\\{9A024DD0-BF6A-4DF1-A034-C61E89E6F711}\\", 00000000): stub
002b:fixme:exec:SHELL_execute flags ignored: 0x00000100
0030:fixme:heap:RtlSetHeapInformation 0x0 1 0x0 0 stub
0030:fixme:ntdll:NtQueryInformationToken QueryInformationToken( ..., TokenElevation, ...) semi-stub
0030:fixme:ole:CoInitializeSecurity (0031F458,-1,00000000,00000000,6,2,00000000,12288,00000000) - stub!
0030:fixme:wuapi:automatic_updates_Pause 
0030:fixme:sfc:SRSetRestorePointW 0031F320 0031F530
0033:fixme:advapi:DecryptFileW (L"C:\\ProgramData\\Package Cache\\{3854F8D0-6FA6-4227-8047-8DE95B0A7DE7}v3.8.9150.0\\core.msi", 00000000): stub
0030:fixme:ntdll:NtLockFile I/O completion on lock not implemented yet
0033:fixme:advapi:DecryptFileW (L"C:\\ProgramData\\Package Cache\\{A3ED59F7-FC59-4793-AEBC-9D3813922BE1}v3.8.9150.0\\exe.msi", 00000000): stub
0030:fixme:ntdll:NtQuerySystemInformation info_class SYSTEM_PERFORMANCE_INFORMATION
0030:err:mscoree:LoadLibraryShim error reading registry key for installroot
0033:fixme:advapi:DecryptFileW (L"C:\\ProgramData\\Package Cache\\{D12B4386-129A-4C17-AB8D-45FD90C6EB0D}v3.8.9150.0\\lib.msi", 00000000): stub
0033:fixme:advapi:DecryptFileW (L"C:\\ProgramData\\Package Cache\\{D9AC2AA4-3635-4476-BDC0-CC9B7992815D}v3.8.9150.0\\pip.msi", 00000000): stub
0030:err:mscoree:LoadLibraryShim error reading registry key for installroot
0037:fixme:thread:create_user_shared_data_thread Creating user shared data update thread.
0030:err:mscoree:LoadLibraryShim error reading registry key for installroot
0041:fixme:msvcrt:_configure_wide_argv (1) stub
0041:fixme:msvcrt:_initialize_wide_environment stub
0041:fixme:msvcrt:__stdio_common_vsprintf options 25 not handled
0041:fixme:ntdll:server_get_file_info Unsupported info class e
0041:fixme:msvcrt:__stdio_common_vsprintf options 25 not handled
0030:fixme:wuapi:automatic_updates_Resume 
0030:fixme:ver:GetCurrentPackageId (0x31fd04 0x0): stub
002b:fixme:ver:GetCurrentPackageId (0x31fd04 0x0): stub
0009:fixme:ver:GetCurrentPackageId (0x31fd04 0x0): stub
```