AutoIt ControlSend() function occasionally replaces hyphens with underscores - automation

Question

I'm using an AutoIt script to automate interaction with a GUI, and part of the process involves using the ControlSend() function to place a file path into a combo box. The majority of the time, the process works properly, but occasionally ( ~ 1/50 calls to the function? ) a single hyphen in the filepath is replaced with an underscore. The script is to be run unsupervised for bulk data processing, and such an error typically results in a forced-focus popup that screams "The file could not be found!" and halts further processing.
Unfortunately, due to the character limit of the combo box, I cannot supply all 16 arguments with a single call, and I am forced to load each of the images individually using the following for-loop:
;Iterate through each command line argument (file path)
For $i = 1 To $CmdLine[0]
;click the "Disk" Button to load an image from disk
ControlClick("Assemble HDR Image", "", "[CLASS:Button; TEXT:Disk; Instance:1]")
;Give the dialogue time to open before entering text
Sleep(1000)
;Send a single file path to the combo box
ControlSend("Open", "" , "Edit1", $CmdLine[$i])
;"Press Enter" to load the image
Send("{ENTER}")
Next
In an errant run, the file path
C:\my\file\path\hdr_2016-04-22T080033_00_rgb
^Hyphen
is converted to
C:\my\file\path\hdr_2016_04-22T080033_00_rgb
^Underscore
Due to the existence of both hyphens and underscores in the file name, it is difficult to perform a programmatic correction (e.g. replace all underscores with hyphens).
What can be done to correct or prevent such an error?
This is both my first attempt at GUI automation and my first question on SO, and I apologize for my lack of experience, poor wording, or deviations from StackOverflow convention.

Answer 1

Just use ControlSetText instead of ControlSend as it will set the complete Text at once and won't allow other keystrokes (like Shift) to interfere with the many virtual keystrokes that the Send-function fires.

Answer 2

If the hyphen is the problem and you need to replace it, you can do so:
#include <File.au3>
; your path
$sPath = 'C:\my\file\path'
; get all files from this path
$aFiles = _FileListToArray($sPath, '*', 1)
; if all your files looks like that (with or without hyphen), you can work with "StringRegExpReplace"
; 'hdr_2016-04-22T080033_00_rgb'
$sPattern = '(\D+\d{4})(.)(.+)'
; it means:
; 1st group: (\D+\d{4})
; \D+ one or more non-digit, i.e. "hdr_"
; \d{4} digit 4-times, i.e. "2016"
; 2nd group: (.)
; . any character, hyphen, underscore or other, only one character, i.e. "~"
; 3rd group: (.+)
; . any character, one or more times, i.e. "22T080033_00_rgb"
; now you change the filename for all cases, where this pattern matches
Local $sTmpName
For $i = 1 To $aFiles[0]
; check for pattern match
If StringRegExp($aFiles[$i]) Then
; replace the 2nd group with underscore
$sTmpName = StringRegExpReplace($aFiles[$i], $sPattern, '\1_\3')
FileMove($sPath & '\' & $aFiles[$i], $sPath & '\' & $sTmpName)
EndIf
Next