sal/rtl/source/macro.cxx 1.13 expandMacros blindly splits ${...} at ':' (even
ignoring '\:' escapes, though '\u003A' escapes of course would work), so that
"${file:///whatever:key}" is split into "file" and "///whatever:key".  In light
of sections ("${file:section:key}") being deprecated and probably not even
working (ArgParserState::expandTerm using dysfunctional(?) oslProfile), a better
approach might be to split at the last ':', so that URLs need not be escaped. 
The documentation at
<http://udk.openoffice.org/common/man/concept/micro_deployment.html> needs to be
fixed (is that also mentioned in the DevGuide?).