I’m creating an installer for an Excel Add-In.

The install adds a value to the Excel Registry tree at:

HKCUSOFTWAREMicrosoftOffice16.0ExcelAdd-in Manager

With is simply the path to the add in, which in turn tells Excel to load it on the add-in list.

When the add in is actually loaded, that is, when the checkmark by the add-in entry is checked and the uses clicks close, Excel deletes that entry and creates one in:

HKCUSOFTWAREMicrosoftOffice16.0ExcelOptionsOPEN

Whose value is the path to the add-in.

However, if we have one or more add-ins installed the OPEN can be OPEN1, OPEN2, or whatever number of add-ins have been loaded by the user.

In my NSI file, I wrote the following code on the uninstall:

; Iterates through the registry and unregisters the Add-In from Excel
; set variable $0 to 0
StrCpy $0 0
; loop through the registry
loop:

LogText "Checking registry key: SOFTWAREMicrosoftOffice16.0ExcelOptions -> OPEN$0"

; read the registry key. Add $0 if $0 != 0
${If} $0 == 0
    ReadRegStr $1 HKCU "SOFTWAREMicrosoftOffice16.0ExcelOptions" "OPEN"
${Else}
    ReadRegStr $1 HKCU "SOFTWAREMicrosoftOffice16.0ExcelOptions" "OPEN$0"
${EndIf}

; check if the registry key is empty
; if it is empty, leave the loop
${if} $1 == ""
    LogText "Registry key is empty. Exiting loop."
    Goto end
${EndIf}

LogText "Registry value: '$1'"

; check if the registry key contains the path to the Add-In
${If} $1 != "$INSTDIRMyAddIn.xlam"
    LogText "Not our Add-In. Skipping..."
    Goto next
${Else}
    ${If} $0 == 0
        LogText "Removing registry key: SOFTWAREMicrosoftOffice16.0ExcelOptions -> OPEN"
        DeleteRegValue HKCU "SOFTWAREMicrosoftOffice16.0ExcelOptions" "OPEN"
    ${Else}
        LogText "Removing registry key: SOFTWAREMicrosoftOffice16.0ExcelOptions -> OPEN$0"
        DeleteRegValue HKCU "SOFTWAREMicrosoftOffice16.0ExcelOptions" "OPEN$0"
    ${EndIf}
    Goto end
${EndIf}

next:

; increment the variable $0
IntOp $0 $0 + 1

; go back to the beginning of the loop
Goto loop

end:

Even though I added the LogText, there is nothing on the log file (install.log on the root of C:) about the uninstall.

Am I doing something wrong here?