Build System not working in Sublime Text 2 under Windows 7 x64?

Question

Windows

The problem was discovered when creating a new build chain for .po (Gettext) files:

{
   "shell": true,
   "cmd": ["C:\\Program Files (x86)\\Poedit\\bin\\msgfmt.exe", "-v", "$file", "-o", "${file/\\.po/\\.mo/}"],
   "selector": ["*.po"],
   "working_dir" : "${file_path}"
}

After launching the build Ctrl+B (F7), the inscription "Building..." appeared in the status and that's it. The output panel remained empty. Tried various options. But there is a suspicion that the interpreter simply does not start. I don't know how to check.
For the test lifted exactly the same configuration on Windows XP SP3. Everything worked like clockwork.
Questions
- Is it possible to somehow find out what's going on during the launch of the build? Any log? Systemic? Program?
— What is the build mechanism? What interpreter is running? What rights does he need?
- Has anyone else met with the specifics of the editor under Windows 7, and in particular under the x64 implementation?
Thank you.
UPD
Thanks GusakovNick, I learned that the logs can be viewed in the console. And my console gave me:

Running C:\Program Files (x86)\Poedit\bin\msgfmt.exe -v \\PATH\languages\ru_RU.po -o \\PATH\languages\ru_RU.mo
Traceback (most recent call last):
  File ".\sublime_plugin.py", line 337, in run_
  File ".\exec.py", line 154, in run
  File ".\exec.py", line 45, in __init__
UnicodeDecodeError: 'ascii' codec cannot decode byte 0xcf in position 175: ordinal not in range(128)

The problem, as it turned out, is that system variables contain Cyrillic characters. And the solution is to change ".\exec.py".

Answer 1

There was a similar problem.
Try to look in the console (ctrl + ~). According to the text of the error, the solution is well googled.

Answer 2

Have you tried running this by hand?