diff --git a/modules/openapi-generator/src/main/resources/powershell/api.mustache b/modules/openapi-generator/src/main/resources/powershell/api.mustache
index d648594aeb4..4e8e046775f 100644
--- a/modules/openapi-generator/src/main/resources/powershell/api.mustache
+++ b/modules/openapi-generator/src/main/resources/powershell/api.mustache
@@ -146,19 +146,34 @@ function {{{vendorExtensions.x-powershell-method-name}}} {
         if (!${{{paramName}}}) {
             throw "Error! The required parameter `{{paramName}}` missing when calling {{operationId}}."
         }
+        {{#isFile}}
+        $LocalVarFormParameters['{{baseName}}'] = $executionContext.SessionState.Path.GetUnresolvedProviderPathFromPSPath(${{{paramName}}})
+        {{/isFile}}
+        {{^isFile}}
         $LocalVarFormParameters['{{baseName}}'] = ${{{paramName}}}
+        {{/isFile}}
 
         {{/isNullable}}
         {{/required}}
         {{^required}}
         {{^isNullable}}
         if (${{{paramName}}}) {
+        {{#isFile}}
+            $LocalVarFormParameters['{{baseName}}'] = $executionContext.SessionState.Path.GetUnresolvedProviderPathFromPSPath(${{{paramName}}})
+        {{/isFile}}
+        {{^isFile}}
             $LocalVarFormParameters['{{baseName}}'] = ${{{paramName}}}
+        {{/isFile}}
         }
 
         {{/isNullable}}
         {{#isNullable}}
+        {{#isFile}}
+        $LocalVarFormParameters['{{baseName}}'] = $executionContext.SessionState.Path.GetUnresolvedProviderPathFromPSPath(${{{paramName}}})
+        {{/isFile}}
+        {{^isFile}}
         $LocalVarFormParameters['{{baseName}}'] = ${{{paramName}}}
+        {{/isFile}}
 
         {{/isNullable}}
         {{/required}}
diff --git a/samples/client/echo_api/powershell/src/PSOpenAPITools/Api/BodyApi.ps1 b/samples/client/echo_api/powershell/src/PSOpenAPITools/Api/BodyApi.ps1
index a786a64a60e..df2424106cb 100644
--- a/samples/client/echo_api/powershell/src/PSOpenAPITools/Api/BodyApi.ps1
+++ b/samples/client/echo_api/powershell/src/PSOpenAPITools/Api/BodyApi.ps1
@@ -198,7 +198,7 @@ function Test-BodyMultipartFormdataArrayOfBinary {
         if (!$Files) {
             throw "Error! The required parameter `Files` missing when calling test_body_multipart_formdata_arrayOfBinary."
         }
-        $LocalVarFormParameters['files'] = $Files
+        $LocalVarFormParameters['files'] = $executionContext.SessionState.Path.GetUnresolvedProviderPathFromPSPath($Files)
 
         $LocalVarResult = Invoke-ApiClient -Method 'POST' `
                                 -Uri $LocalVarUri `
@@ -273,7 +273,7 @@ function Test-BodyMultipartFormdataSingleBinary {
         $LocalVarUri = '/body/application/octetstream/single_binary'
 
         if ($MyFile) {
-            $LocalVarFormParameters['my-file'] = $MyFile
+            $LocalVarFormParameters['my-file'] = $executionContext.SessionState.Path.GetUnresolvedProviderPathFromPSPath($MyFile)
         }
 
         $LocalVarResult = Invoke-ApiClient -Method 'POST' `
diff --git a/samples/client/petstore/powershell/src/PSPetstore/Api/PSFakeApi.ps1 b/samples/client/petstore/powershell/src/PSPetstore/Api/PSFakeApi.ps1
index 87f58e94686..5e0f3d23604 100644
--- a/samples/client/petstore/powershell/src/PSPetstore/Api/PSFakeApi.ps1
+++ b/samples/client/petstore/powershell/src/PSPetstore/Api/PSFakeApi.ps1
@@ -909,7 +909,7 @@ function Test-PSEndpointParameters {
         $LocalVarFormParameters['byte'] = $Byte
 
         if ($Binary) {
-            $LocalVarFormParameters['binary'] = $Binary
+            $LocalVarFormParameters['binary'] = $executionContext.SessionState.Path.GetUnresolvedProviderPathFromPSPath($Binary)
         }
 
         if ($Date) {
diff --git a/samples/client/petstore/powershell/src/PSPetstore/Api/PSPetApi.ps1 b/samples/client/petstore/powershell/src/PSPetstore/Api/PSPetApi.ps1
index 863d7864a1a..ccbc594a4c6 100644
--- a/samples/client/petstore/powershell/src/PSPetstore/Api/PSPetApi.ps1
+++ b/samples/client/petstore/powershell/src/PSPetstore/Api/PSPetApi.ps1
@@ -679,7 +679,7 @@ function Invoke-PSUploadFile {
         }
 
         if ($File) {
-            $LocalVarFormParameters['file'] = $File
+            $LocalVarFormParameters['file'] = $executionContext.SessionState.Path.GetUnresolvedProviderPathFromPSPath($File)
         }
 
 
@@ -778,7 +778,7 @@ function Invoke-PSUploadFileWithRequiredFile {
         if (!$RequiredFile) {
             throw "Error! The required parameter `RequiredFile` missing when calling uploadFileWithRequiredFile."
         }
-        $LocalVarFormParameters['requiredFile'] = $RequiredFile
+        $LocalVarFormParameters['requiredFile'] = $executionContext.SessionState.Path.GetUnresolvedProviderPathFromPSPath($RequiredFile)
 
 
         $LocalVarResult = Invoke-PSApiClient -Method 'POST' `