Unable to modify vCurrentPath and vCurrentFile in tally prime

Respected sir, I am unable to modify vCurrentPath and vCurrentFile in tally prime
I want to choose any file...
Please sir help me..


[#Menu : Gateway Of Tally]
Add : Key item : before : @@locQuit : @@GSTR2BIMPORT : I : Alter : GSTR2BIMPORT : $EnableGOP:Company:##SVCurrentCompany ;Call: ImportGSTR2Vouchers2

[Report: GSTR2BIMPORT]
Title : $$LocaleString:"Import GSTR2B Data"
Auto : Yes
Form : GSTR2B Import
Set : vCurrentPath : $$String:"E:\";$ExportPath:AppINIConfig:"AppINIConfig"
Set : vCurrentFile : "Test.xlsx"
Set : ExcelPath : ##vCurrentPath + "\" + ##vCurrentFile
Set : ResultPath : $$String##vCurrentPath + ($$StringWordEx:##vCurrentFile:".":1) + "2.xlsx")

[Form: GSTR2B Import]
Use : Blank Buttons Template
Full Height : No
Full Width : No
Space Left : 3
Space Right : 3
Space Top : 1.5
Space Bottom: 1.5
Part : GSTR2B Import
On:Form Accept:Yes:Call:ImportGSTR2B


[Part: GSTR2B Import]
Lines : GSTR2BTitle, GSTR2BSubTitle, GSTR2BImportPath, GSTR2BImportFile, ExcelPathInfo, ResultPathInfo
Local : Field : Long Prompt : Width : @@LongWidth + 5

[Line: GSTR2BTitle]
Fields : GSTR2BTitle

[Field: GSTR2BTitle]
Set as : "GSTR2B Import"
Style : Normal Bold
FullWidth : Yes
Border : Thin Bottom
Align : Centre
Skip : Yes
Fixed : Yes

[Line: GSTR2BSubTitle]
Field : GSTR2BTitle
Local : Field : GSTR2BTitle : Info : $$LocaleString:"(Only Tally Excel format is supported)"
Local : Field : GSTR2BTitle : Style : Normal Italic
Local : Field : GSTR2BTitle : Delete : Border

[Line: GSTR2BImportPath]
Fields : Long Prompt, ImportPath
Space Top : 0.5
Local : Field : Long Prompt : Info : $$LocaleString:"File path:"

[Line: GSTR2BImportFile]
Fields : Long Prompt , ImportFile
Space Top : 0.5
Local : Field : Long Prompt : Info : $$LocaleString : "File to import (Excel)"

[Line: ExcelPathInfo]
Fields : Long Prompt
Space Top : 0.5
Local : Field : Long Prompt : Info : $$LocaleString:"Excel Path is " + @@ExcelPath

[Line: ResultPathInfo]
Fields : Long Prompt
Space Top : 0.5
Local : Field : Long Prompt : Info : $$LocaleString:"Result Excel Path is " + @@ResultPath