[Bug] NMGUI2 uses single quotes for Windows paths, causing cmd.exe syntax error

[huangwenge12]

Describe the bug
Running NONMEM model via NMGUI2 on Windows throws path syntax error. The generated command uses single quotes to wrap file paths, which is not compatible with Windows Command Prompt.

Command generated by NMGUI2 (failed):
'D:\PsN-5.7.0\strawberry\perl\bin\execute.BAT' 'I:\001.mod' -directory=001

Manually modified command (works fine):
After replacing single quotes with double quotes, the command executes successfully.