Maybe resolves #84

Author: ClassicOldSong

src/platform/windows/misc.cpp

@@ -1848,7 +1848,7 @@ namespace platf {
     }
 
     // Get the output size required to store the string
-    auto output_size = MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS, string.data(), string.size(), nullptr, 0);
+    auto output_size = MultiByteToWideChar(CP_UTF8, 0, string.data(), string.size(), nullptr, 0);
     if (output_size == 0) {
       auto winerr = GetLastError();
       BOOST_LOG(error) << "Failed to get UTF-16 buffer size: "sv << winerr;
@@ -1857,7 +1857,7 @@ namespace platf {
 
     // Perform the conversion
     std::wstring output(output_size, L'\0');
-    output_size = MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS, string.data(), string.size(), output.data(), output.size());
+    output_size = MultiByteToWideChar(CP_UTF8, 0, string.data(), string.size(), output.data(), output.size());
     if (output_size == 0) {
       auto winerr = GetLastError();
       BOOST_LOG(error) << "Failed to convert string to UTF-16: "sv << winerr;

src/process.cpp

@@ -966,6 +966,7 @@ namespace proc {
           // when it contains spaces. Unlike POSIX, Windows forbids quotes in paths,
           // so we can safely strip them all out here to avoid confusing the user.
           boost::erase_all(ctx.working_dir, "\"");
+          ctx.working_dir += '\\';
 #endif
         }