If you are creating mkgmap tiles and you do not need to distribute your map to others, then the NSIS installer is not required.
Initial installation requires importing registration data (.reg file).
Creating an NSIS installer takes time and then installing setup.exe also takes time.
For instance:
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Garmin\MapSource\Families\BIKE_Benelux]
"ID"=hex:4a,9c
"IDX"="G:\\BaseCamp\\BIKE_Benelux\\40010000.mdx"
"MDR"="G:\\BaseCamp\\BIKE_Benelux\\40010000_mdr.img"
"TYP"="G:\\BaseCamp\\BIKE_Benelux\\40010.TYP"
[HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Garmin\MapSource\Families\BIKE_Benelux\1]
"BMAP"="G:\\BaseCamp\\BIKE_Benelux\\40010000.img"
"LOC"="G:\\BaseCamp\\BIKE_Benelux"
"TDB"="G:\\BaseCamp\\BIKE_Benelux\\40010000.tdb"
Is there a way to create the REG file with Mkgmap, or do I have to create it by myself after generating the map ? If so, what is the meaning of the ID value and how do I choose the right one ?