REG2SRC stands for 'Registrykey to PCOM-sourcefile'-convertor.

Usage:

REG2SRC NEWKEY.REG

Doing this a NEWKEY.SRC is created.

Example:

Using regedit you exported the following 'MYKEY.REG'-hkey:

REGEDIT4

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion]
"USERNAME"="ExEd!"
"COMPANYNAME"="ExEd!'s homebase"

After running the REG2SCR MYKEY.REG command the following MYKEY.SCR file is created:

;
; Created with REG2SRC:
; Job: 'testreg.reg'->'testreg.SCR'.
;
#HKEY.REG
"REGEDIT4
.
.
"[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion]
.
""USERNAME"="ExEd!"
.
""COMPANYNAME"="ExEd!'s homebase"
.
-
$run:regedit /s HKEY.REG
$del:HKEY.REG
;
; End of conversion.
;

As you can see a temporary file 'HKEY.REG' is created, imported in the users registry and removed. The only line you need to add in your original source is: $INC:MYKEY.SRC and the registry update is implemented!