I used a tool called TEXTCRAWLER, a free download, to change all SINGLE-DIGIT Episode Numbers to TWO-DIGIT Episode Numbers with a leading zero.
Use the INPUT FOLDER tab.
I set the FILE FILTER to "*.xml"
START LOCATION set to the ROOT of the share, so that it does them ALL at the same time.
UNCHECK Case Sensitive, Multi-line Anchors, and Dot Matches Newline.
Use the REGULAR EXPRESSION tab.
Set RegEx to: (\d)\s-\s(\d)\s
Set "Replace" to: $1[space]-[space]0$2[space]
Make sure you change [space] to an actual SPACE when you type.
Also, that character BEFORE the "$2" is a ZERO, not an OH.
So, in TEXT, that Replace String is spelled "Dollar One Space Hyphen Space Zero Dollar Two Space"
Then click the REPLACE button, and follow the prompts.
I would recommend you copy all your XML files to a safe place before starting. That way if you mess it up, you can just restore them back.
If you just want to do it by hand, use Microsoft's XML Notepad (Another free download.)