Can wildcards and variables be used in a Microsoft Ajax Minifier manifest file?

I am using the Microsoft Ajax Minifier to minify my javascript files. In the manifest, I would like to specify that all js files in a source folder should be minified into a different output folder. The original filename should be used as the output filename plus a variable should be appended. I would like to do something like the manifest below where the output uses a * wildcard and the variable is a version number of 4.60.

<?xml version="1.0" encoding="utf-8"?>
$(version) = "-4.60"
<root>
    <output path="..\Scripts\Pages\*$(version)" type="js">
        <input path="Scripts\PageSource\" type="js" />
    </output>
</root>

Using a * in the output setting throws a build error but maybe there is a different wildcard character? There are a lot of output and input settings, which is why I'd like to specify a version number once and reuse it.

Could any of the settings in the targets file (see below) be used for this purpose? I could not find any examples that show what the ProjectDefaultSwitches and Configuration settings do.

<!-- target to build all ajaxmin manifest files in the project -->
<Target Name="BuildAjaxMinManifests" AfterTargets="Build">
    <Message Text="Processing AjaxMin Manifests" Importance="high" />
    <CreateItem Include="@(None)" Condition="'%(Extension)'=='.ajaxmin'">
        <Output TaskParameter="Include" ItemName="AjaxMinManifests"/>
    </CreateItem>

    <AjaxMinManifestTask ProjectDefaultSwitches="-define:$(DefineConstants))"
                         Configuration="$(Configuration)"
                         TreatWarningsAsErrors="false"
                         InputFolder="$(ProjectDir)"
                         OutputFolder="$(ProjectDir)Content\"
                         Manifests="@(AjaxMinManifests)" />
</Target>

Is this possible?

So far it appears that it is not possible to use wildcards and variables in the manifest files but I was able to accomplish my overall goal by using the second approach that @stijn suggested. Here is what I did:

1. Downloaded and installed the Microsoft Ajax Minifier
2. Located the installation folder and copied the AjaxMin.dll, AjaxMin.exe, AjaxMinifier.exe, and AjaxMinTask.dll files into the Build folder of the project. If there is more than one developer then this folder should be under source control.
3. Created a file called AjaxMin.targets in the Build folder of the project. The contents of the file is:

<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003"> <UsingTask TaskName="AjaxMinManifestTask" AssemblyFile="$(ProjectDir)Build\AjaxMinTask.dll" /> <Target Name="BuildAjaxMinManifests" AfterTargets="Build"> <Message Text="Processing Manifest" Importance="high" /> <CreateItem Include="@(None)" Condition="'%(Extension)'=='.ajaxmin'"> <Output TaskParameter="Include" ItemName="AjaxMinManifests"/> </CreateItem> <AjaxMinManifestTask ProjectDefaultSwitches="-define:$(DefineConstants)" Configuration="$(Configuration)" TreatWarningsAsErrors="false" InputFolder="$(ProjectDir)" OutputFolder="$(ProjectDir)" Manifests="@(AjaxMinManifests)" /> <Message Text="Processing Pages" Importance="high" /> <PropertyGroup> <VerNumber>4-62-0-0</VerNumber> </PropertyGroup> <ItemGroup> <ToMinify Include="$(ProjectDir)Scripts\PageSource\*.js"/> </ItemGroup> <Exec Command="$(ProjectDir)Build\AjaxMin.exe %(ToMinify.Identity) -out $(ProjectDir)Scripts\Pages\%(ToMinify.FileName)-$(VerNumber).js -clobber" /> </Target> </Project>

4. Unloaded and then edited the project to add the following at the bottom:

<Import Project="$(MSBuildProjectDirectory)\Build\AjaxMin.targets" />

5. Made sure the Scripts\PageSource files and Scripts\Pages folder existed.
6. Closed and reopened the solution.
7. Rebuilt the solution.

TIP: It seems that changes to the AjaxMin.targets file are not recognized until the solution is reopened. I wasted an entire day going down rabbit holes until I figured this out.

The AjaxMinManifestTask portion of the AjaxMin.targets file kicks off a minification and consolidation of a number of js and css files according to a manifest. The format of the manifest XML is documented at the Microsoft Ajax Minifier website.

The Processing Pages portion of the AjaxMin.targets file kicks off a minification of every file in the Scripts\PageSource folder and outputs the result to the Scripts\Pages folder. It also appends the VerNumber value to the resulting filename.