exec-maven-plugin: Execution of Windows executables broken in 1.5.0

I’m using exec-maven-plugin on Windows to run npm install in a JS project.

<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<version>1.4.0</version>
<executions>
    <execution>
        <id>npm install</id>
        <phase>generate-resources</phase>
        <goals>
            <goal>exec</goal>
        </goals>
        <configuration>
            <executable>npm</executable>
            <commandlineArgs>install --registry ${npm.registry}</commandlineArgs>
        </configuration>
    </execution>
</executions>

which works fine with 1.4.0 but switching to 1.5.0 results in

[INFO] --- exec-maven-plugin:1.5.0:exec (npm install) @ util ---
[ERROR] Command execution failed.
java.io.IOException: Cannot run program "C:\Program Files\nodejs\npm" (in directory "D:\Workspaces\git-repositories\myproject"): CreateProcess error=193, %1 ist keine zulässige Win32-Anwendung
        at java.lang.ProcessBuilder.start(ProcessBuilder.java:1048)
        at java.lang.Runtime.exec(Runtime.java:620)
        at org.apache.commons.exec.launcher.Java13CommandLauncher.exec(Java13CommandLauncher.java:61)
        at org.apache.commons.exec.DefaultExecutor.launch(DefaultExecutor.java:279)
        at org.apache.commons.exec.DefaultExecutor.executeInternal(DefaultExecutor.java:336)
        at org.apache.commons.exec.DefaultExecutor.execute(DefaultExecutor.java:166)
        at org.codehaus.mojo.exec.ExecMojo.executeCommandLine(ExecMojo.java:764)
        at org.codehaus.mojo.exec.ExecMojo.executeCommandLine(ExecMojo.java:711)
        at org.codehaus.mojo.exec.ExecMojo.execute(ExecMojo.java:289)
        at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:134)
        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:208)
        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
        at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:116)
        at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:80)
        at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:51)
        at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:128)
        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:307)
        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:193)
        at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:106)
        at org.apache.maven.cli.MavenCli.execute(MavenCli.java:862)
        at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:286)
        at org.apache.maven.cli.MavenCli.main(MavenCli.java:197)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:497)
        at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289)
        at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229)
        at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)
        at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)
Caused by: java.io.IOException: CreateProcess error=193, %1 ist keine zulässige Win32-Anwendung
        at java.lang.ProcessImpl.create(Native Method)
        at java.lang.ProcessImpl.<init>(ProcessImpl.java:386)
        at java.lang.ProcessImpl.start(ProcessImpl.java:137)
        at java.lang.ProcessBuilder.start(ProcessBuilder.java:1029)
        ... 30 more