Command line with password

Not sure if this is a bug or problem, but.
I have created a basic app to transfer 1 text file to a device. Part of bigger program.
It is all working well and have it so I get the stdIO from my app and display info
in a text box. I can see all current info in my app.

I have also added error checking ie, no file exists, no destination folder exists, wrong password for a device.

However, I have my password which is 11 characters. it authenticates and transfers the file
if I delete 3 characters from password and try again, it still works!
Also if I add other characters on the end it still works!

I also ran the WinSCP.exe program to test as well.
I enter my 11 digit password and as expected it works, however
if I now delete the last 3 characters and login, all works and WinSCP.exe opens up
ready to work.

If I delete the 4 characters from my 11 digit password, then it fails.

Is this a bug any difference in password should fail.

Pls advise.

P.S love the program and use it all the time, hence writing a program that I need
to SFTP a file.

Just to make it clear, my app uses WinSCP.com with commandline to transfer 1 file.
Password does not work as it should, as stated above

Possibly you have pageant running with private key loaded, so that the password is not used at all.

It's difficult to provide any help without seeing a log file.

Hi, thanks for replying.
Don't know what pageant is. In my VB6 app, I just shell a command line to transfer a file
If I alter the password on last 3 digits of 11 digit pass then transfer completes.
If I alter 4 then fails.

I also ran WinSCP.exe and have my details save without password. (previously have entered and ran).
I then doubleclick the entry in WinSCP.exe and it asks me for password, if I only alter 8 digits of my password then it opens up and shows me the directory. I can also add any other digits to the end of 8 digits and it still works.

Running on Windows 7, WinSCP 5.1.5.
Not a major problem as its just for my own use.
Thanks

Again, please attach a complete session log file for all scenarios (with description for each log).