File association using CMD

Question

What are ways to associate file from cmd? For example,I want .txt file extension to associate with a typical program, through command prompt? what is the correct file association cmd command?

Answer 1

One needs to use ftype and assoc commands as follows (and note that sequence matters):

ftype txtfile="C:\Program Files (x86)\PSPad editor\PSPad.exe" "%1"
assoc .log=txtfile
assoc .txt=txtfile
assoc .wtx=txtfile

or

ftype TIFImage.Document="C:\Program Files\MSPVIEW.exe" "%1"
assoc .tif=TIFImage.Document
assoc .tiff=TIFImage.Document

Note that I haven't MSPVIEW.exe installed so I can't approve your ftype assignment rightness. In my Windows ftype TIFImage.Document command output is as follows:

TIFImage.Document=%SystemRoot%\System32\rundll32.exe "%ProgramFiles%\Windows Photo Viewer\PhotoViewer.dll", ImageView_Fullscreen %1

Answer 2

File association with COMMAND PROMPT (using .bat file):

REG ADD "HKEY_CLASSES_ROOT\Applications\notepad++.exe\shell\open\command"     /v ""     /t REG_SZ     /d "\"C:\Program Files\\Notepad++\\notepad++.exe\" \"%%1\""       /f
::or use --------------->  REG ADD "HKEY_CLASSES_ROOT\txtfile\shell\open\command"                        /v ""     /t REG_SZ     /d "\"C:\Program Files\\Notepad++\\notepad++.exe\" \"%%1\""       /f
REG ADD "HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.txt"                 /v "Application"   /t REG_SZ     /d "notepad++.exe"      /f
REG ADD "HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.txt\OpenWithList"    /v "g"             /t REG_SZ     /d "notepad++.exe"      /f

ftype txtfile="C:\Program Files\Notepad++\notepad++.exe" "%%1"      
assoc .txt=txtfile

NOTE! If typing directly in CMD(instead of .bat) then use single % (instead of double %%) and single \ (instead of double \)