[MWRAPPER-72] Windows mvnw.cmd from root directory of drive fails with java usage display

**[Clifford W Johnson](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=cljohnso)** opened **[MWRAPPER-72](https://issues.apache.org/jira/browse/MWRAPPER-72?redirect=false)** and commented

Attempting to use `.\mvnw.cmd` when the project root is at the root of a Windows drive (as would happen if `subst Z: ` is used) results in the script displaying the `java` usage information and not performing the expected Maven operation. It seems that `java` has an issue in parsing the command line argument `{}"-Dmaven.multiModuleProjectDirectory=Z:\"{`}.

My local work-around was to append a dot/period (`{}.{`}) to the `EXEC_DIR` if `EXEC_DIR` ends with `` `":\"{`}.

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**Affects:** 0.5.6

**Attachments:**
- [mvnw-cmd_failure.txt](https://issues.apache.org/jira/secure/attachment/13046321/mvnw-cmd_failure.txt) (_5.47 kB_)