How to add new items to right-click event on Folders and Files in Windows?

Question

I did google couple of tutorials on google.

I am able to add right-click menu item to a FOLDER by doing this:

[HKEY_CLASSES_ROOT\\Di         


        

Answer 1

See GitHub SingleInstanceAccumulator for a C# implementation of the well worn Mutex + COPYDATA approach to this.

other stack-o's expressing the need.

Explorer Context Menu config

::creates the entry
:: and crucial multi-file handling property
reg add "HKEY_CLASSES_ROOT\FileType\shell\YourNewContextMenu" /f /v "MultiSelectModel" /d "Player"

::your desired command line
reg add "HKEY_CLASSES_ROOT\FileType\shell\YourNewContextMenu\command" /f /ve /t REG_EXPAND_SZ /d "***see command line examples***"

e.g. On my system, for ".mov" files, I would replace FileType above with VLC.mov

Complex REG ADD example

Replace "* see command line examples *" above with your desired command line.
Note: quotes & environment variables must be escaped and escaping work slightly differently for the initial command versus later in the string!?!

λ reg add "HKEY_CLASSES_ROOT\VLC.mov\shell\Transcode\command" /f /ve /t REG_EXPAND_SZ /d "\"^%bin^%\SingleInstanceAccumulator\" -f \"-c:powershell -ExecutionPolicy bypass "\"^%bin^%\test.ps1\"" -list '$files'\" \"%1\""

SingleInstanceAccumulator.exe Usage

"-c:command line" (default: cmd /c echo $files && pause)
  $files will be replace with aggregated list

-f = output each item on separate line to new tempfile
  $files will be replaced by the tempfile path
  quote will default to nothing

-d:delimiter (default: ,)
-q:quote (default: ")
-t:timeout millisecs (default: 200)
-w = hidden launch
-v = debug output

Command Line Examples

note: initial command must have path for shell > command to work

PowerShell & temp file

note: -f usage

"%bin%\SingleInstanceAccumulator" -f "-c:powershell -ExecutionPolicy bypass "%bin%\test.ps1" -list '$files'" "%1"

PowerShell & inline files list

note: -q usage

"%bin%\SingleInstanceAccumulator" -q:' "-c:powershell -ExecutionPolicy bypass "%bin%\test.ps1" -list $files" "%1"

test.ps1 (with temp file)

powershell
param(
  [String]$listFilePath
)

gc $listFilePath | % { $_ }

pause

erase $listFilePath

pause

test.ps1 (with files array parm)

param(
  [String[]]$filesList
)

$filesList | % { $_ }

pause