We are using Jenkins on windows and set our workspaces and builds to be a separate directory to the standard jenkins install directory on windows.

This all works fine for our ant builds with our build artefacts stored in U:\jenkins\builds

However we have recently added some maven3 builds.
These work fine if you have the Build Record Root Directory set to the default as: ${ITEM_ROOTDIR}/builds
And the build folders exists as: C:\Program Files (x86)\Jenkins\jobs\<job name>\modules\<groupId>$<artifactId>

However changing the Build Record Root Directory to u:/jenkins/builds/${ITEM_FULLNAME} it then tries to create the directory with a colon rather than a dollar in the directory name, this fails on windows.
e.g.
u:\jenkins\builds\<job name>\<groupId>:<artifactId>

I can confirm running jenkins on linux the same occurs, however the colon is not a problem (as its an allowed character).

Started by user Sam Webber
Building on master
Updating http://svnserver/svn/ss/platform/branches/wc/wc_maven_migration/core/ss-core
At revision 181408
no revision recorded for http://svnserver/svn/ss/platform/branches/wc/wc_maven_migration/core/ss-core in the previous build
Parsing POMs
Modules changed, recalculating dependency graph
ERROR: Failed to parse POMs
java.io.FileNotFoundException: u:\jenkins\builds\wc.ss-core\com.ss:ss-core\2011-12-23_19-09-32\log (The filename, directory name, or volume label syntax is incorrect)
at java.io.FileOutputStream.open(Native Method)
at java.io.FileOutputStream.<init>(Unknown Source)
at java.io.FileOutputStream.<init>(Unknown Source)
at hudson.maven.MavenBuild$ProxyImpl2.<init>(MavenBuild.java:474)
at hudson.maven.MavenModuleSetBuild$RunnerImpl.doRun(MavenModuleSetBuild.java:686)
at hudson.model.AbstractBuild$AbstractRunner.run(AbstractBuild.java:462)
at hudson.model.Run.run(Run.java:1404)
at hudson.maven.MavenModuleSetBuild.run(MavenModuleSetBuild.java:481)
at hudson.model.ResourceController.execute(ResourceController.java:88)
at hudson.model.Executor.run(Executor.java:238)
FATAL: Failed to create a temporary file in u:\jenkins\builds\wc.ss-core\com.ss:ss-core\2011-12-23_19-09-32
hudson.util.IOException2: Failed to create a temporary file in u:\jenkins\builds\wc.ss-core\com.ss:ss-core\2011-12-23_19-09-32
at hudson.util.AtomicFileWriter.<init>(AtomicFileWriter.java:67)
at hudson.util.AtomicFileWriter.<init>(AtomicFileWriter.java:54)
at hudson.XmlFile.write(XmlFile.java:170)
at hudson.model.Run.save(Run.java:1540)
at hudson.maven.MavenModuleSetBuild$RunnerImpl.post2(MavenModuleSetBuild.java:1011)
at hudson.model.AbstractBuild$AbstractRunner.post(AbstractBuild.java:614)
at hudson.model.Run.run(Run.java:1429)
at hudson.maven.MavenModuleSetBuild.run(MavenModuleSetBuild.java:481)
at hudson.model.ResourceController.execute(ResourceController.java:88)
at hudson.model.Executor.run(Executor.java:238)
Caused by: java.io.IOException: The filename, directory name, or volume label syntax is incorrect
at java.io.WinNTFileSystem.createFileExclusively(Native Method)
at java.io.File.checkAndCreate(Unknown Source)
at java.io.File.createTempFile(Unknown Source)
at hudson.util.AtomicFileWriter.<init>(AtomicFileWriter.java:65)
... 9 more