this can not be directly implemented in Dashy (as far as i know).
you cannot start directly a EXE from your disk drive for security reasons.
you need to register a protocol handler that starts putty (or any other application)

i implemented this function this way:

create a Folder (in my case "C:\Users\alex\_myApps\alex-Protokoll\")
Download Auto Hot Key https://www.autohotkey.com and install it
adopt "start_rdp.ahk" "start_putty.ahk" to your situation
compile *.ahk files using Auto Hot Key -> see Documentation https://www.autohotkey.com/docs/v1/Scripts.htm#ahk2exe -> Ahk2Exe.exe /in "MyScript.ahk"
create a link "start_RDP_link" that executes "%windir%\system32\mstsc.exe"
adopt "protocol.reg" to your situation
import "protocol.reg" to windows registry
try in your browser: alexstartputty://1.2.3.4/ or with a port: alexstartputty://some.where.com:25289/
putty should start and will greet you with a login

content of "start_putts.ahk":
STARTFILE
; get program parameter
parameter = %1%

; remove protocol handler (in this case alexProt:) from parameter
StringReplace, parameter, parameter, alexStartPutty://
StringReplace, parameter, parameter, /

; start putty
run C:\Users\alex\_myApps\Putty\putty.exe %parameter%
ENDFILE

content of "start_rdp.ash"
STARTFILE
; get program parameter 1
parameter = %1%

; remove protocol handler (in this case alexProt:) from parameter
StringReplace, parameter, parameter, alexStartRDP://
StringReplace, parameter, parameter, /

; start RDP
run C:\Users\alex\_myApps\alex-Protokoll\start_RDP_link.lnk /v %parameter%
ENDFILE

Adopt this "protocol.reg" file to your needs and import this into Windows Registry - this provides RDP, Putty/SSH and open Network Share:
STARTFILE
Windows Registry Editor Version 5.00

[HKEY_CLASSES_ROOT\alexStartPutty]
@="URL:alexStartPutty Protocol"
"URL Protocol"=""

[HKEY_CLASSES_ROOT\alexStartPutty\shell]

[HKEY_CLASSES_ROOT\alexStartPutty\shell\open]

[HKEY_CLASSES_ROOT\alexStartPutty\shell\open\command]
@=""C:\Users\alex\_myApps\alex-Protokoll\start_putty.exe" "%1""

[HKEY_CLASSES_ROOT\alexStartRDP]
@="URL:alexStartRDP Protocol"
"URL Protocol"=""

[HKEY_CLASSES_ROOT\alexStartRDP\shell]

[HKEY_CLASSES_ROOT\alexStartRDP\shell\open]

[HKEY_CLASSES_ROOT\alexStartRDP\shell\open\command]
@=""C:\Users\alex\_myApps\alex-Protokoll\start_rdp.exe" "%1""
ENDFILE

i implemented this because i wanted in Nagios/Icinga a direct action to connect to the host with the current alert....

have fun

AutoHotkey

Free keyboard macro program. Supports hotkeys for keyboard, mouse, and joystick. Can expand abbreviations as you type them (AutoText).

[FEATURE_REQUEST] Open desktop application (Putty, RDP, etc) #1099

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