diff --git a/x-pack/plugins/security_solution/public/entity_analytics/components/asset_criticality_file_uploader/constants.ts b/x-pack/plugins/security_solution/public/entity_analytics/components/asset_criticality_file_uploader/constants.ts
index c64128274aa3d..966068eb4c074 100644
--- a/x-pack/plugins/security_solution/public/entity_analytics/components/asset_criticality_file_uploader/constants.ts
+++ b/x-pack/plugins/security_solution/public/entity_analytics/components/asset_criticality_file_uploader/constants.ts
@@ -5,5 +5,11 @@
  * 2.0.
  */
 
-export const SUPPORTED_FILE_TYPES = ['text/csv', 'text/plain', 'text/tab-separated-values'];
+export const SUPPORTED_FILE_TYPES = [
+  'text/csv',
+  'text/plain',
+  'text/tab-separated-values',
+  '.tsv', // Useful for Windows when it can't recognise the file extension.
+  '.csv', // Useful for Windows when it can't recognise the file extension.
+];
 export const SUPPORTED_FILE_EXTENSIONS = ['CSV', 'TXT', 'TSV'];
diff --git a/x-pack/plugins/security_solution/public/entity_analytics/components/asset_criticality_file_uploader/hooks.test.ts b/x-pack/plugins/security_solution/public/entity_analytics/components/asset_criticality_file_uploader/hooks.test.ts
index 675535365a0b0..a3b9a2e0ce24e 100644
--- a/x-pack/plugins/security_solution/public/entity_analytics/components/asset_criticality_file_uploader/hooks.test.ts
+++ b/x-pack/plugins/security_solution/public/entity_analytics/components/asset_criticality_file_uploader/hooks.test.ts
@@ -37,12 +37,13 @@ describe('useFileValidation', () => {
   test('should call onError when an error occurs', () => {
     const onErrorMock = jest.fn();
     const onCompleteMock = jest.fn();
+    const invalidFileType = 'invalid file type';
 
     const { result } = renderHook(
       () => useFileValidation({ onError: onErrorMock, onComplete: onCompleteMock }),
       { wrapper: TestProviders }
     );
-    result.current(new File([invalidLine], 'test.csv'));
+    result.current(new File([invalidLine], 'test.csv', { type: invalidFileType }));
 
     expect(onErrorMock).toHaveBeenCalled();
     expect(onCompleteMock).not.toHaveBeenCalled();
diff --git a/x-pack/plugins/security_solution/public/entity_analytics/components/asset_criticality_file_uploader/validations.test.ts b/x-pack/plugins/security_solution/public/entity_analytics/components/asset_criticality_file_uploader/validations.test.ts
index 4e742d4d92505..4a77e024528dd 100644
--- a/x-pack/plugins/security_solution/public/entity_analytics/components/asset_criticality_file_uploader/validations.test.ts
+++ b/x-pack/plugins/security_solution/public/entity_analytics/components/asset_criticality_file_uploader/validations.test.ts
@@ -56,6 +56,14 @@ describe('validateFile', () => {
     expect(result.valid).toBe(true);
   });
 
+  it('should return valid if the mime type is empty (Windows)', () => {
+    const file = new File(['file content'], 'test.csv', { type: '' });
+
+    const result = validateFile(file, formatBytes);
+
+    expect(result.valid).toBe(true);
+  });
+
   it('should return an error message if the file type is invalid', () => {
     const file = new File(['file content'], 'test.txt', { type: 'invalid-type' });
 
diff --git a/x-pack/plugins/security_solution/public/entity_analytics/components/asset_criticality_file_uploader/validations.ts b/x-pack/plugins/security_solution/public/entity_analytics/components/asset_criticality_file_uploader/validations.ts
index 06018a2496768..6f8bd8fb816bf 100644
--- a/x-pack/plugins/security_solution/public/entity_analytics/components/asset_criticality_file_uploader/validations.ts
+++ b/x-pack/plugins/security_solution/public/entity_analytics/components/asset_criticality_file_uploader/validations.ts
@@ -53,7 +53,10 @@ export const validateFile = (
   file: File,
   formatBytes: (bytes: number) => string
 ): { valid: false; errorMessage: string; code: string } | { valid: true } => {
-  if (!SUPPORTED_FILE_TYPES.includes(file.type)) {
+  if (
+    file.type !== '' && // file.type might be an empty string on windows
+    !SUPPORTED_FILE_TYPES.includes(file.type)
+  ) {
     return {
       valid: false,
       code: 'unsupported_file_type',