Claus Gittinger uploaded a new version of Monticello to project The Inbox:
http://source.squeak.org/inbox/Monticello-cg.529.mcz

==================== Summary ====================

Name: Monticello-cg.529
Author: cg
Time: 25 March 2013, 2:10:09.446 pm
UUID: 0bcc62fe-400b-4dba-8d91-6dc1aefbbcbf
Ancestors: Monticello-cg.528

allow colons and slashes in a package's name (MCVersion generated an invalid filename for those). 
Needed to be able to load monticello packages as written by ST/X. (Does not affect squeak/pharo operation, as those packages do not normally contain such characters)

=============== Diff against Monticello-bf.527 ===============

Item was changed:
  ----- Method: MCVersion>>fileName (in category 'accessing') -----
  fileName
+ 	|rawName cookedName|
+ 
+ 	rawName := info name.
+ 	"care for invalid filename characters"
+ 	cookedName := rawName copy 
+ 						replaceAll: $/ with: $_;
+ 						replaceAll: $: with: $_..
+ 	^ (cookedName, '.', self writerClass extension) asMCVersionName!
- 	^ (info name, '.', self writerClass extension) asMCVersionName!