This is a msbuild file for downloading the TransifexCliente (tx.exe) on demand

tx.targets.xml

<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
    <PropertyGroup>
        <TransifexClientExePath Condition=" '$(TransifexClientExePath)' == '' ">$(MSBuildThisFileDirectory)tx.exe</TransifexClientExePath>
    </PropertyGroup>

    <Target Name="CheckPrerequisites">
        <SetEnvironmentVariable EnvKey="VisualStudioVersion" EnvValue="$(VisualStudioVersion)" Condition=" '$(VisualStudioVersion)' != '' AND '$(OS)' == 'Windows_NT' " />
        <!--
        Take advantage of MsBuild's build dependency tracking to make sure that we only ever download nuget.exe once.
        This effectively acts as a lock that makes sure that the download operation will only happen once and all
        parallel builds will have to wait for it to complete.
        -->
        <MsBuild Targets="_DownloadTransifexClient" Projects="$(MSBuildThisFileFullPath)" Properties="Configuration=NOT_IMPORTANT" />
    </Target>

    <Target Name="_DownloadTransifexClient">
        <DownloadTransifexClient OutputFilename="$(TransifexClientExePath)" Condition="!Exists('$(TransifexClientExePath)')" />
    </Target>
    
    <UsingTask TaskName="DownloadTransifexClient" TaskFactory="CodeTaskFactory" AssemblyFile="$(MSBuildToolsPath)\Microsoft.Build.Tasks.v4.0.dll">
        <ParameterGroup>
            <OutputFilename ParameterType="System.String" Required="true" />
        </ParameterGroup>
        <Task>
            <Reference Include="System.Core" />
            <Using Namespace="System" />
            <Using Namespace="System.IO" />
            <Using Namespace="System.Net" />
            <Using Namespace="Microsoft.Build.Framework" />
            <Using Namespace="Microsoft.Build.Utilities" />
            <Code Type="Fragment" Language="cs">
                <![CDATA[
                try {
                    OutputFilename = Path.GetFullPath(OutputFilename);

                    Log.LogMessage("Downloading version 0.9 of tx.exe...");
                    WebClient webClient = new WebClient();
                    webClient.DownloadFile("http://files.transifex.com/transifex-client/0.9/tx.exe", OutputFilename);

                    return true;
                }
                catch (Exception ex) {
                    Log.LogErrorFromException(ex);
                    return false;
                }
            ]]>
            </Code>
        </Task>
    </UsingTask>
    
     <UsingTask TaskName="SetEnvironmentVariable" TaskFactory="CodeTaskFactory" AssemblyFile="$(MSBuildToolsPath)\Microsoft.Build.Tasks.v4.0.dll">
        <ParameterGroup>
            <EnvKey ParameterType="System.String" Required="true" />
            <EnvValue ParameterType="System.String" Required="true" />
        </ParameterGroup>
        <Task>
            <Using Namespace="System" />
            <Code Type="Fragment" Language="cs">
                <![CDATA[
                try {
                    Environment.SetEnvironmentVariable(EnvKey, EnvValue, System.EnvironmentVariableTarget.Process);
                }
                catch  {
                }
            ]]>
            </Code>
        </Task>
    </UsingTask>
</Project>