Instances in Progress Explorer get lost when using multi Progress versions

Progress Explorer not retaining servers
Instances in Progress Explorer get lost when using multiple Progress versions on the same machine

10.X is wiping out 9.1X's proexp12.msc file and vice versa

In order to fix the issue, please follow steps above:

1) Progress 9.1D

- go to %DLC% directory
- copy proexp12.msc to proexp_91d.msc
- backup proexp.prm file

- edit proexp.prm and remove the lines:
@{Startup\DLC}\bin\runproexp.exe
@{Startup\DLC}

add the lines:
mmc
/s
<full-directory-path-to-91d-dlc-dir>/proexp_91d.msc

2) OpenEdge 10.X

- go to %DLC% directory
- copy proexp12.msc to proexp_100x.msc
- backup proexp.prm file

- edit proexp.prm and remove the lines:
@{Startup\DLC}\bin\runproexp.exe
@{Startup\DLC}

add the lines:
mmc
/s
<full-directory-path-to-OE10.X-dlc-dir>/proexp_100x.msc

3) Now  both Progress Explorers (9.1D/10.X) will retain servers

References to Written Documentation:

P110424,"Progress Explorer 9.1D not retaining added servers on XP, SP2"