The error message in the application is
The private keys unlock failed. The error was "Could not decrypt input string"

I tried the download of two different versions of Multibit Classic 0.5.19 and 0.5.15. and unfortunately neither would import my file !!
I have then spent alot of time working through recreating the problem and looking for patterns. I did find that the openSSL command which is shown in all the documentation did not work even on a freshly created encrypted key file with a password that I had entered 2 minutes previously !!! i thought I had cracked it when I fell upon a one line suggestion which was to add teh qualifier -md md5 to the openssl command. That solved the problem with the test file I created yesterday from givign an error 12732 EVP_DECRYPTFINAL_EX:BAD DECRYPT
but I was absolutely gutted to find it didnt quite decypher my key file.
The output it came up with appeared to bee close with teh same sort of structure  i.e. private key string and then spaces and then date although the characters were not as expected e.g. "*****¬†½4B™B‚“åÒ'***" and "¿ƒ" for a date.....
 As I say I feel I might be close but that doesnt get me my keys back !!  I have started trying alot of other parameters  but as yu can probably tell from my ramblings I am working on trial and error rather than any in depth knowledge of why these things are working !!!
Any suggestions would be very gratefully received

I unfortunately only have the exported Key file which appear in the right format !!  Unfortunately the laptop with the original wallet on has been wiped   Can anyone give me hope that the Key file can be intepretted to get the private keys?