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digitalmars.D.bugs - [Issue 20571] New: spawnProcess does not find .bat files


          Issue ID: 20571
           Summary: spawnProcess does not find .bat files
           Product: D
           Version: D2
          Hardware: x86
                OS: Windows
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: phobos
          Assignee: nobody puremagic.com
          Reporter: johnnymarler gmail.com

When you execute a program "foo" with spawnProcess, it will find "foo.exe" if
it is a file in the PATH environment variable.  However, it will not find
programs with the ".bat" extension.

When searching for a program in PATH on windows, all files with an extension
from the PATHEXT environment variable should be checked, i.e.


I've created a small program to demonstrate/reproduce this issue:

import std.file, std.process, std.stdio;

void main(string[] args)
    if (args.length == 1)
        writeln("running from an exe!");
void runTest()
    const runDir = "C:\\temp\\testworkdir";
    const pathDir = "C:\\temp\\testpathdir";
    if (!exists(runDir)) mkdir(runDir);
    if (!exists(pathDir)) mkdir(pathDir);

    const thisExe = thisExePath();
    writefln("thisExePath is '%s'", thisExe);
    const tempExe = pathDir ~ "\\anexeprogram.exe";
    std.file.copy(thisExe, tempExe);

    environment["PATH"] = environment["PATH"] ~ ";" ~ pathDir;
    writefln("Added '%s' to path", pathDir);
    run(["anexeprogram", "recursive"]); // works

    const tempBat = pathDir ~ "\\abatprogram.bat";
        auto batFile = File(tempBat, "w");
        batFile.writeln(" echo running from a bat file");
    run(["abatprogram.bat"]); // works
    run(["abatprogram"]); // FAILS

void run(string[] args)
    writefln("Running %s", args);
    auto p = spawnProcess(args);
    assert(0 == wait(p));

Feb 08 2020