Need to modify a working VBScript to use variables

Hello again everyone,

RobSamson was kind enough to author a VScript for me.
It works great and I am very pleased.

Here's what the short script looks like:
Set objShell = CreateObject("WScript.Shell")
strCommand = "cmd /c C:\BETASys\exf.exe  -c ""C:\BETASys\BETASys.md5"" > ""%USERPROFILE%\AppData\Local\Test\Intergrity_check_results.txt"""
objShell.Run strCommand, 1, True

Now, I should like to request a bit of help modifying RobSamson's work some. (If I might.)

The current script has three parameters:
The first parameter is the location and name of an executable that I want to run:
C:\BETASys\exf.exe  
The second parameter is the location and name of an input file, that the executble in the first parameter will use:
-c ""C:\BETASys\BETASys.md5
And the thrid parameter, is where to send the output when the executable defined in the first parameter is run.
> ""%USERPROFILE%\AppData\Local\Test\Intergrity_check_results.txt"""

Now for my issue:
The folder locations for the first two parameters could be different each time I run this script.

What I would like to do (if it makes sense) is ....
Early in the script, I will populate a variable with what I want the first parameter to look like.
And I'll do the same for the second parameter.
I have some VBScript skills and I can do this.

Assuming the first variable is named "var1" and the second, is named "var2", how would I use var1 and var2, in the current line of strCommand = "cmd /c C:\BETASys\exf.exe  -c ""C:\BETASys\BETASys.md5"" > ""%USERPROFILE%\AppData\Local\Test\Intergrity_check_results.txt""" ?

Does that makes sense ?
........
........
Yes.
Yes, I think it does.

Thank so very much for any replies.

Good morning.