# IOpcFileInfo Members
> Reference: Represents a single file in OPC UA and provides properties and instance methods for accessing files.
- Type
- IOpcFileInfo
- Namespace
- Opc.UaFx
- Assembly
- Opc.UaFx.Advanced.dll
- Package
- Opc.UaFx.Advanced v2.59.0
## Properties
### Exists
Gets a value indicating whether a file exists.
```csharp
bool Exists { get; }
```
```vbnet
ReadOnly Property Exists As Boolean
```
**Property value**
[Boolean](https://learn.microsoft.com/dotnet/api/system.boolean)
The value true if the file exists; false if the file does not exist.
### IsReadOnly
Gets or sets a value that determines if the current file is read only.
```csharp
bool IsReadOnly { get; }
```
```vbnet
ReadOnly Property IsReadOnly As Boolean
```
**Property value**
[Boolean](https://learn.microsoft.com/dotnet/api/system.boolean)
The value true if the current file is read only; otherwise the value false.
### Length
Gets the size, in bytes, of the current file.
```csharp
long Length { get; }
```
```vbnet
ReadOnly Property Length As Long
```
**Property value**
[Int64](https://learn.microsoft.com/dotnet/api/system.int64)
The size of the current file in bytes.
## Methods
### GetMimeType
Determines the internet media type (mime- or content-type) of the file.
```csharp
string GetMimeType()
```
```vbnet
Function GetMimeType() As String
```
**Returns**
[String](https://learn.microsoft.com/dotnet/api/system.string)
The type name according to the specification of multipurpose internet mail extensions (MIME) of the file represented.
### Open
Opens a file in the specified mode.
```csharp
Stream Open(OpcFileMode mode)
```
```vbnet
Function Open(mode As OpcFileMode) As Stream
```
**Parameters**
| Name | Type | Description |
|---|---|---|
| `mode` | [OpcFileMode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcfilemode/) | A [OpcFileMode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcfilemode/) value specifying the mode in which to open the file. |
**Returns**
[Stream](https://learn.microsoft.com/dotnet/api/system.io.stream)
A file opened in the specified mode.
**Exceptions**
| Exception | Condition |
|---|---|
| [ArgumentException](https://learn.microsoft.com/dotnet/api/system.argumentexception) | The file `mode` specified is invalid. |
### Refresh
Refreshes the state of the object.
```csharp
void Refresh()
```
```vbnet
Sub Refresh()
```
**Exceptions**
| Exception | Condition |
|---|---|
| [IOException](https://learn.microsoft.com/dotnet/api/system.io.ioexception) | A device such as a disk drive is not ready. |