Eryk Sun added the comment:
I can confirm that the CRT function construct_environment_block() does cause an
access violation sometimes when no "=x:" shell variables are defined in the
current environment. These "=x:" environment variables are the way that Windows
emulates DOS per-drive working directories in a shell. The API itself never
sets these variables; it only uses them if they're defined.
You should be able to avoid this bug by defining the environment variable
"=C:". The simplest way to do this in Python is via os.chdir. For example:
import os
cwd = os.getcwd()
try:
os.chdir('C:')
finally:
os.chdir(cwd)
The implementation of os.chdir calls SetCurrentDirectoryW, which, for a
drive-relative path such as "C:", will first look for an "=x:" environment
variable and otherwise default to the root directory. After it changes the
process current working directory, chdir() calls GetCurrentDirectoryW and
SetEnvironmentVariableW to set the new value of the "=x:" variable.
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<http://bugs.python.org/issue29908>
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